diff --git a/src/main/java/com/gxwebsoft/common/system/controller/MainController.java b/src/main/java/com/gxwebsoft/common/system/controller/MainController.java
index 80090b5..b868d99 100644
--- a/src/main/java/com/gxwebsoft/common/system/controller/MainController.java
+++ b/src/main/java/com/gxwebsoft/common/system/controller/MainController.java
@@ -237,6 +237,77 @@ public class MainController extends BaseController {
     return success("登录成功", new LoginResult(access_token, user));
   }
 
+  @Operation(summary = "邮箱登录（支持跨租户）")
+  @PostMapping("/loginByEmail")
+  public ApiResult<LoginResult> loginByEmail(@RequestBody LoginParam param, HttpServletRequest request) {
+    // 设置过期时间
+    Long tokenExpireTime = configProperties.getTokenExpireTime();
+    final String email = param.getEmail();
+    final String password = param.getPassword();
+    if (StrUtil.isBlank(email) || StrUtil.isBlank(password)) {
+      return fail("参数不能为空");
+    }
+    // 跨租户：按邮箱查询所有租户下的账号
+    List<User> users = userService.findAccountsByEmail(email);
+    if (users == null || users.isEmpty()) {
+      String message = "用户不存在";
+      loginRecordService.saveAsync(email, LoginRecord.TYPE_ERROR, message, null, request);
+      return fail(message, null);
+    }
+    User user;
+    if (users.size() == 1) {
+      user = users.get(0);
+    } else {
+      // 同一邮箱在多个租户下存在，需用户选择具体租户
+      if (param.getTenantId() == null) {
+        User first = users.get(0);
+        first.setHasAdminsByPhone(true);
+        return success("请选择登录用户", new LoginResult(null, first));
+      }
+      user = users.stream()
+          .filter(u -> u.getTenantId().equals(param.getTenantId()))
+          .findFirst()
+          .orElse(null);
+      if (user == null) {
+        return fail("用户不存在", null);
+      }
+    }
+    if (!user.getStatus().equals(0)) {
+      String message = "账号被冻结";
+      loginRecordService.saveAsync(email, LoginRecord.TYPE_ERROR, message, user.getTenantId(), request);
+      return fail(message, null);
+    }
+    if (!userService.comparePassword(user.getPassword(), password)) {
+      String message = "密码错误";
+      loginRecordService.saveAsync(email, LoginRecord.TYPE_ERROR, message, user.getTenantId(), request);
+      return fail(message, null);
+    }
+    // 登录成功
+    loginRecordService.saveAsync(email, LoginRecord.TYPE_LOGIN, null, user.getTenantId(), request);
+
+    final JSONObject register = cacheClient.getSettingInfo("register", user.getTenantId());
+    if (register != null) {
+      final String ExpireTime = register.getString("tokenExpireTime");
+      if (ExpireTime != null) {
+        tokenExpireTime = Long.valueOf(ExpireTime);
+      }
+    }
+
+    // 签发token
+    String access_token = JwtUtil.buildToken(new JwtSubject(user.getUsername(), user.getTenantId()),
+      tokenExpireTime, configProperties.getTokenKey());
+    // 同步redis
+    redisUtil.set("access_token:" + user.getUserId(), access_token, tokenExpireTime, TimeUnit.SECONDS);
+    return success("登录成功", new LoginResult(access_token, user));
+  }
+
+  @Operation(summary = "查询邮箱下全部账号（跨租户，用于多账号选择）")
+  @GetMapping("/listAdminsByEmailAll")
+  public ApiResult<?> listAdminsByEmailAll(LoginParam param) {
+    final List<User> accounts = userService.findAccountsByEmail(param.getEmail());
+    return success(accounts);
+  }
+
   @Operation(summary = "检查用户是否存在")
   @GetMapping("/existence")
   public ApiResult<?> existence(ExistenceParam<User> param) {
diff --git a/src/main/java/com/gxwebsoft/common/system/mapper/xml/UserMapper.xml b/src/main/java/com/gxwebsoft/common/system/mapper/xml/UserMapper.xml
index c6c8683..b56f60e 100644
--- a/src/main/java/com/gxwebsoft/common/system/mapper/xml/UserMapper.xml
+++ b/src/main/java/com/gxwebsoft/common/system/mapper/xml/UserMapper.xml
@@ -380,6 +380,17 @@
     ORDER BY a.create_time DESC
   </select>
 
+  <!-- 根据邮箱查询所有账号（忽略租户隔离，用于跨租户邮箱登录） -->
+  <select id="selectAccountsByEmail" resultType="com.gxwebsoft.common.system.entity.User">
+    SELECT a.*,
+           t.tenant_name
+    FROM sys_user a
+           LEFT JOIN sys_tenant t ON a.tenant_id = t.tenant_id
+    WHERE a.deleted = 0
+      AND a.email = #{email}
+    ORDER BY a.create_time DESC
+  </select>
+
   <!-- 根据手机号统计账号数量（忽略租户隔离） -->
   <select id="countByPhone" resultType="java.lang.Integer">
     SELECT COUNT(1)
diff --git a/src/main/java/com/gxwebsoft/common/system/param/LoginParam.java b/src/main/java/com/gxwebsoft/common/system/param/LoginParam.java
index 41d67f2..8049b6e 100644
--- a/src/main/java/com/gxwebsoft/common/system/param/LoginParam.java
+++ b/src/main/java/com/gxwebsoft/common/system/param/LoginParam.java
@@ -28,6 +28,9 @@ public class LoginParam implements Serializable {
     @Schema(description = "手机号码")
     private String phone;
 
+    @Schema(description = "邮箱")
+    private String email;
+
     @Schema(description = "短信验证码")
     private String code;
 
diff --git a/src/main/java/com/gxwebsoft/common/system/service/UserService.java b/src/main/java/com/gxwebsoft/common/system/service/UserService.java
index 58a3c31..4e50822 100644
--- a/src/main/java/com/gxwebsoft/common/system/service/UserService.java
+++ b/src/main/java/com/gxwebsoft/common/system/service/UserService.java
@@ -156,6 +156,14 @@ public interface UserService extends IService<User>, UserDetailsService {
      */
     List<User> findAccountsByPhone(String phone);
 
+    /**
+     * 根据邮箱查询所有账号（忽略租户隔离，用于跨租户登录）
+     *
+     * @param email 邮箱
+     * @return List<User>
+     */
+    List<User> findAccountsByEmail(String email);
+
     /**
      * 根据手机号统计账号数量
      *
diff --git a/src/main/java/com/gxwebsoft/common/system/service/impl/UserServiceImpl.java b/src/main/java/com/gxwebsoft/common/system/service/impl/UserServiceImpl.java
index 4842db5..2f5e20d 100644
--- a/src/main/java/com/gxwebsoft/common/system/service/impl/UserServiceImpl.java
+++ b/src/main/java/com/gxwebsoft/common/system/service/impl/UserServiceImpl.java
@@ -473,6 +473,14 @@ public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements Us
         return baseMapper.selectAccountsByPhone(phone);
     }
 
+    @Override
+    public List<User> findAccountsByEmail(String email) {
+        if (StrUtil.isBlank(email)) {
+            return null;
+        }
+        return baseMapper.selectAccountsByEmail(email);
+    }
+
     @Override
     public Integer countAccountsByPhone(String phone) {
         if (StrUtil.isBlank(phone)) {