diff --git a/src/main/java/com/campus/water/controller/RegisterController.java b/src/main/java/com/campus/water/controller/RegisterController.java
new file mode 100644
index 0000000..1abe416
--- /dev/null
+++ b/src/main/java/com/campus/water/controller/RegisterController.java
@@ -0,0 +1,35 @@
+package com.campus.water.controller;
+
+import com.campus.water.entity.dto.request.RegisterRequest;
+import com.campus.water.service.RegisterService;
+import com.campus.water.util.ResultVO;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import jakarta.validation.Valid;
+
+/**
+ * 注册接口控制器（公共接口）
+ */
+@RestController
+@RequestMapping("/api/common")
+public class RegisterController {
+
+    @Autowired
+    private RegisterService registerService;
+
+    /**
+     * 用户注册接口
+     * @param registerRequest 注册请求参数
+     * @return 注册结果
+     */
+    @PostMapping("/register")
+    public ResponseEntity<ResultVO<Boolean>> register(@Valid @RequestBody RegisterRequest registerRequest) {
+        boolean success = registerService.register(registerRequest);
+        return ResponseEntity.ok(ResultVO.success(success, "注册成功"));
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/campus/water/entity/dto/request/RegisterRequest.java b/src/main/java/com/campus/water/entity/dto/request/RegisterRequest.java
new file mode 100644
index 0000000..7283377
--- /dev/null
+++ b/src/main/java/com/campus/water/entity/dto/request/RegisterRequest.java
@@ -0,0 +1,29 @@
+package com.campus.water.entity.dto.request;
+
+import lombok.Data;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
+
+@Data
+public class RegisterRequest {
+    @NotBlank(message = "用户名不能为空")
+    private String username;
+
+    @NotBlank(message = "密码不能为空")
+    @Pattern(regexp = "^[a-zA-Z0-9]{6,16}$", message = "密码必须为6-16位字母或数字")
+    private String password;
+
+    @NotBlank(message = "用户类型不能为空")
+    private String userType; // admin/user/repairer
+
+    // 用户特有字段
+    private String studentId; // 学生ID（仅user类型需要）
+    private String studentName; // 学生姓名（仅user类型需要）
+
+    // 管理员特有字段
+    private String adminId; // 管理员ID（仅admin类型需要）
+    private String adminRole; // 管理员角色（仅admin类型需要，SUPER_ADMIN/NORMAL_ADMIN）
+
+    // 维修人员特有字段
+    private String repairmanId; // 维修人员ID（仅repairer类型需要）
+}
\ No newline at end of file
diff --git a/src/main/java/com/campus/water/mapper/AdminRepository.java b/src/main/java/com/campus/water/mapper/AdminRepository.java
index 5c66864..40800cf 100644
--- a/src/main/java/com/campus/water/mapper/AdminRepository.java
+++ b/src/main/java/com/campus/water/mapper/AdminRepository.java
@@ -38,4 +38,8 @@ public interface AdminRepository extends JpaRepository<AdminPO, String> {
 
     // 检查手机号是否存在
     boolean existsByPhone(String phone);
+
+    // 检查用户名是否存在
+    boolean existsByUsername(String username);
+
 }
\ No newline at end of file
diff --git a/src/main/java/com/campus/water/mapper/UserRepository.java b/src/main/java/com/campus/water/mapper/UserRepository.java
index 68f9565..9613c5a 100644
--- a/src/main/java/com/campus/water/mapper/UserRepository.java
+++ b/src/main/java/com/campus/water/mapper/UserRepository.java
@@ -38,6 +38,9 @@ public interface UserRepository extends JpaRepository<UserPO, String> {
     // 检查邮箱是否已存在
     boolean existsByEmail(String email);
 
+    // 检查用户名是否存在
+    boolean existsByUsername(String username);
+
     // ========== 新增：登录核心方法（必须） ==========
     Optional<UserPO> findByUsername(String username);
 }
\ No newline at end of file
diff --git a/src/main/java/com/campus/water/service/RegisterService.java b/src/main/java/com/campus/water/service/RegisterService.java
new file mode 100644
index 0000000..c7d5e2c
--- /dev/null
+++ b/src/main/java/com/campus/water/service/RegisterService.java
@@ -0,0 +1,103 @@
+package com.campus.water.service;
+
+import com.campus.water.entity.dto.request.RegisterRequest;
+import com.campus.water.entity.po.AdminPO;
+import com.campus.water.entity.po.RepairerAuthPO;
+import com.campus.water.entity.po.UserPO;
+import com.campus.water.mapper.AdminRepository;
+import com.campus.water.mapper.RepairerAuthRepository;
+import com.campus.water.mapper.UserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.util.DigestUtils;
+
+import java.nio.charset.StandardCharsets;
+
+@Service
+public class RegisterService {
+
+    @Autowired
+    private AdminRepository adminRepository;
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Autowired
+    private RepairerAuthRepository repairerAuthRepository;
+
+    public boolean register(RegisterRequest request) {
+        String username = request.getUsername();
+        // 密码MD5加密（与登录逻辑保持一致）
+        String encryptedPwd = DigestUtils.md5DigestAsHex(
+                request.getPassword().getBytes(StandardCharsets.UTF_8)
+        );
+        String userType = request.getUserType();
+
+        switch (userType) {
+            case "admin":
+                handleAdminRegister(username, encryptedPwd, request);
+                break;
+            case "user":
+                handleUserRegister(username, encryptedPwd, request);
+                break;
+            case "repairer":
+                handleRepairerRegister(username, encryptedPwd, request);
+                break;
+            default:
+                throw new RuntimeException("无效的用户类型：" + userType);
+        }
+        return true;
+    }
+
+    private void handleAdminRegister(String username, String password, RegisterRequest request) {
+        // 检查用户名是否已存在
+        if (adminRepository.existsByUsername(username)) {
+            throw new RuntimeException("管理员用户名已存在");
+        }
+
+        AdminPO admin = new AdminPO();
+        admin.setUsername(username);
+        admin.setPassword(password);
+        admin.setAdminId(request.getAdminId());
+        admin.setRole(AdminPO.AdminRole.valueOf(request.getAdminRole()));
+        admin.setStatus(AdminPO.AdminStatus.ACTIVE);
+
+        adminRepository.save(admin);
+    }
+
+    private void handleUserRegister(String username, String password, RegisterRequest request) {
+        if (userRepository.existsByUsername(username)) {
+            throw new RuntimeException("用户名已存在");
+        }
+        if (userRepository.existsByStudentId(request.getStudentId())) {
+            throw new RuntimeException("学号已被注册");
+        }
+
+        UserPO user = new UserPO();
+        user.setUsername(username);
+        user.setPassword(password);
+        user.setStudentId(request.getStudentId());
+        user.setUsername(request.getStudentName());
+        user.setStatus(UserPO.UserStatus.ACTIVE);
+        // 可根据需要补充其他字段默认值
+
+        userRepository.save(user);
+    }
+
+    private void handleRepairerRegister(String username, String password, RegisterRequest request) {
+        if (repairerAuthRepository.existsByUsername(username)) {
+            throw new RuntimeException("维修人员用户名已存在");
+        }
+        if (repairerAuthRepository.existsByRepairmanId(request.getRepairmanId())) {
+            throw new RuntimeException("维修人员ID已被注册");
+        }
+
+        RepairerAuthPO repairer = new RepairerAuthPO();
+        repairer.setUsername(username);
+        repairer.setPassword(password);
+        repairer.setRepairmanId(request.getRepairmanId());
+        repairer.setAccountStatus(RepairerAuthPO.AccountStatus.active);
+
+        repairerAuthRepository.save(repairer);
+    }
+}
\ No newline at end of file