diff --git a/rc-service/rc-service-other/other-application/src/main/java/com/red/circle/other/app/command/activity/ClaimActivityRewardExe.java b/rc-service/rc-service-other/other-application/src/main/java/com/red/circle/other/app/command/activity/ClaimActivityRewardExe.java
index d095786a..2656338d 100644
--- a/rc-service/rc-service-other/other-application/src/main/java/com/red/circle/other/app/command/activity/ClaimActivityRewardExe.java
+++ b/rc-service/rc-service-other/other-application/src/main/java/com/red/circle/other/app/command/activity/ClaimActivityRewardExe.java
@@ -9,8 +9,11 @@ import com.red.circle.other.app.dto.clientobject.activity.ClaimRewardResultCO;
 import com.red.circle.other.app.dto.cmd.activity.ClaimActivityRewardCmd;
 import com.red.circle.other.domain.gateway.props.ActivitySourceGroupGateway;
 import com.red.circle.other.infra.database.rds.dao.activity.UserActivityRewardClaimDAO;
+import com.red.circle.other.infra.database.rds.entity.activity.LotteryDeviceRecord;
 import com.red.circle.other.infra.database.rds.entity.activity.UserActivityRewardClaim;
+import com.red.circle.other.infra.database.rds.service.activity.LotteryDeviceRecordService;
 import com.red.circle.other.infra.database.rds.service.activity.UserActivityRechargeService;
+import com.red.circle.other.infra.database.rds.service.user.device.LatestMobileDeviceService;
 import com.red.circle.other.inner.asserts.OtherErrorCode;
 import com.red.circle.other.inner.endpoint.activity.LotteryTicketClient;
 import com.red.circle.other.inner.enums.activity.PropsActivityTypeEnum;
@@ -41,12 +44,17 @@ public class ClaimActivityRewardExe {
     private final UserActivityRechargeService userActivityRechargeService;
     private final UserActivityRewardClaimDAO userActivityRewardClaimDAO;
     private final LotteryTicketClient lotteryTicketClient;
+    private final LatestMobileDeviceService latestMobileDeviceService;
+    private final LotteryDeviceRecordService lotteryDeviceRecordService;
 
     @Transactional(rollbackFor = Exception.class)
     public ClaimRewardResultCO execute(ClaimActivityRewardCmd cmd) {
         PropsActivityTypeEnum activityType = PropsActivityTypeEnum.valueOf(cmd.getActivityType());
         SysOriginPlatformEnum sysOrigin = SysOriginPlatformEnum.valueOf(cmd.getReqSysOrigin().getOrigin());
 
+        // 2. 校验设备唯一性（防止小号薅羊毛）
+        checkDeviceUnique(cmd.getActivityId(), cmd.getReqUserId());
+
         List<ActivityPropsRule> ruleConfigs = activitySourceGroupGateway.listRule(sysOrigin, activityType);
         ActivityPropsRule targetRule = ruleConfigs.stream()
             .filter(rule -> Objects.equals(rule.getId(), cmd.getRuleId()))
@@ -108,6 +116,27 @@ public class ClaimActivityRewardExe {
             .setLotteryTicketIds(ticketIds);
     }
 
+    /**
+     * 校验设备唯一性（防止小号薅羊毛）
+     */
+    private void checkDeviceUnique(Long activityId, Long userId) {
+        String fingerprint = latestMobileDeviceService.getEnhancedDeviceFingerprintByUserId(userId);
+
+        if (com.red.circle.tool.core.text.StringUtils.isBlank(fingerprint)) {
+            log.warn("Failed to get device fingerprint, userId: {}", userId);
+            return;
+        }
+
+        LotteryDeviceRecord existingRecord = lotteryDeviceRecordService
+                .getByActivityAndFingerprint(activityId, fingerprint);
+
+        if (existingRecord != null && !existingRecord.getUserId().equals(userId)) {
+            log.warn("Duplicate device detected, activityId: {}, currentUser: {}, boundUser: {}, fingerprint: {}",
+                    activityId, userId, existingRecord.getUserId(), fingerprint);
+            ResponseAssert.isTrue(OtherErrorCode.DEVICE_ALREADY_USED, false);
+        }
+    }
+
     private BigDecimal parseRequiredAmount(String jsonData) {
         if (StrUtil.isBlank(jsonData)) {
             return null;