diff --git a/pigx-upms/pigx-upms-biz/src/main/java/com/pig4cloud/pigx/admin/handler/MiniAppLoginHandler.java b/pigx-upms/pigx-upms-biz/src/main/java/com/pig4cloud/pigx/admin/handler/MiniAppLoginHandler.java
index ea3ff832b..e94fec39e 100644
--- a/pigx-upms/pigx-upms-biz/src/main/java/com/pig4cloud/pigx/admin/handler/MiniAppLoginHandler.java
+++ b/pigx-upms/pigx-upms-biz/src/main/java/com/pig4cloud/pigx/admin/handler/MiniAppLoginHandler.java
@@ -17,6 +17,7 @@
 
 package com.pig4cloud.pigx.admin.handler;
 
+import cn.hutool.core.util.RandomUtil;
 import cn.hutool.core.util.StrUtil;
 import cn.hutool.http.HttpRequest;
 import cn.hutool.http.HttpUtil;
@@ -24,6 +25,7 @@ import cn.hutool.json.JSONObject;
 import cn.hutool.json.JSONUtil;
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.pig4cloud.pigx.admin.api.constant.UpmsErrorCodes;
+import com.pig4cloud.pigx.admin.api.dto.RegisterUserDTO;
 import com.pig4cloud.pigx.admin.api.dto.UserDTO;
 import com.pig4cloud.pigx.admin.api.dto.UserInfo;
 import com.pig4cloud.pigx.admin.api.entity.SysSocialDetails;
@@ -33,10 +35,12 @@ import com.pig4cloud.pigx.admin.service.SysUserService;
 import com.pig4cloud.pigx.common.core.constant.CacheConstants;
 import com.pig4cloud.pigx.common.core.constant.SecurityConstants;
 import com.pig4cloud.pigx.common.core.constant.enums.LoginTypeEnum;
+import com.pig4cloud.pigx.common.core.constant.enums.YesNoEnum;
 import com.pig4cloud.pigx.common.core.exception.CheckedException;
 import com.pig4cloud.pigx.common.core.util.MsgUtils;
 import com.pig4cloud.pigx.common.core.util.R;
 import com.pig4cloud.pigx.common.data.cache.RedisUtils;
+import com.pig4cloud.pigx.common.data.resolver.ParamResolver;
 import com.pig4cloud.pigx.common.data.tenant.TenantContextHolder;
 import lombok.AllArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -117,9 +121,11 @@ public class MiniAppLoginHandler extends AbstractLoginHandler {
 
     /**
      * 根据手机号获取用户信息。
+     * <p>
+     * 用户不存在且注册功能（SITE_REGISTER_ENABLE）开启时，自动以手机号注册新用户后返回。
      *
      * @param phone 用户手机号
-     * @return 用户信息对象，未找到时返回null
+     * @return 用户信息对象，未找到且无法自动注册时返回null
      */
     @Override
     public UserInfo info(String phone) {
@@ -133,12 +139,31 @@ public class MiniAppLoginHandler extends AbstractLoginHandler {
 
         R<UserInfo> userInfoR = sysUserService.getUserInfo(userDTO);
 
-        if (userInfoR.getData() == null) {
-            log.info("小程序手机号不存在用户:{}", phone);
+        if (userInfoR.getData() != null) {
+            return userInfoR.getData();
+        }
+
+        // 用户不存在：注册功能开启时自动注册，开关判断与 SysRegisterController 保持一致
+        if (!YesNoEnum.YES.getCode().equals(ParamResolver.getStr("SITE_REGISTER_ENABLE", YesNoEnum.NO.getCode()))) {
+            log.info("小程序手机号不存在用户且未开启注册功能:{}", phone);
             return null;
         }
 
-        return userInfoR.getData();
+        RegisterUserDTO registerUserDTO = new RegisterUserDTO();
+        registerUserDTO.setUsername(phone);
+        registerUserDTO.setPhone(phone);
+        // 初始密码为 10 位随机数字
+        registerUserDTO.setPassword(RandomUtil.randomNumbers(10));
+        registerUserDTO.setTenantId(TenantContextHolder.getTenantId());
+
+        R<Boolean> registerResult = sysUserService.registerUser(registerUserDTO);
+        if (!registerResult.isOk()) {
+            log.warn("小程序自动注册用户失败:{},{}", phone, registerResult.getMsg());
+            return null;
+        }
+
+        log.info("小程序自动注册用户成功:{}", phone);
+        return sysUserService.getUserInfo(userDTO).getData();
     }
 
     /**