diff --git a/src/main/java/com/biutag/supervision/service/MailBoxCaptureService.java b/src/main/java/com/biutag/supervision/service/MailBoxCaptureService.java
index e37504b..740d280 100644
--- a/src/main/java/com/biutag/supervision/service/MailBoxCaptureService.java
+++ b/src/main/java/com/biutag/supervision/service/MailBoxCaptureService.java
@@ -4,6 +4,8 @@ import cn.hutool.core.collection.CollectionUtil;
 import cn.hutool.core.util.IdUtil;
 import cn.hutool.core.util.StrUtil;
 import com.alibaba.fastjson2.JSON;
+import com.alibaba.fastjson2.JSONArray;
+import com.alibaba.fastjson2.JSONObject;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.biutag.supervision.constants.enums.AccountabilityTargetEnum;
 import com.biutag.supervision.constants.enums.BusinessTypeEnum;
@@ -50,9 +52,11 @@ import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 /**
@@ -110,6 +114,7 @@ public class MailBoxCaptureService {
             log.info("【局长信箱抓取新信件】查询到投诉举报信件信件数量：{}", mailList.size());
 
             Map<String, String> involveProblemMapping = loadMayorMailboxInvolveProblemMapping();
+            Set<String> mergedMailboxOriginIds = loadMergedMailboxOriginIds();
 
             // 3. 遍历处理
             int successCount = 0;
@@ -118,6 +123,11 @@ public class MailBoxCaptureService {
 
             for (Mail mail : mailList) {
                 try {
+                    if (mergedMailboxOriginIds.contains(mail.getId())) {
+                        skipCount++;
+                        log.info("【局长信箱抓取新信件】跳过已合并源件: mailId={}", mail.getId());
+                        continue;
+                    }
                     // 每条记录在独立事务中执行
                     boolean success = Boolean.TRUE.equals(transactionTemplate.execute(status -> {
                         return doCaptureSingleMail(mail, involveProblemMapping);
@@ -262,6 +272,45 @@ public class MailBoxCaptureService {
         return exists;
     }
 
+    /**
+     * 从合并历史中提取已合并的局长信箱源件编号，供抓取任务排除。
+     */
+    private Set<String> loadMergedMailboxOriginIds() {
+        Set<String> originIds = new HashSet<>();
+        List<ComplaintCollection> mergedRecords = complaintCollectionMapper.selectList(
+                new LambdaQueryWrapper<ComplaintCollection>()
+                        .select(ComplaintCollection::getMergeHistory)
+                        .isNotNull(ComplaintCollection::getMergeHistory)
+                        .ne(ComplaintCollection::getMergeHistory, "")
+        );
+
+        for (ComplaintCollection record : mergedRecords) {
+            try {
+                JSONObject history = JSON.parseObject(record.getMergeHistory());
+                JSONArray merges = history == null ? null : history.getJSONArray("merges");
+                if (CollectionUtil.isEmpty(merges)) {
+                    continue;
+                }
+                for (Object merge : merges) {
+                    JSONObject mergeRecord = JSON.parseObject(JSON.toJSONString(merge));
+                    if (mergeRecord == null) {
+                        continue;
+                    }
+                    if (ComplaintCollectionSourceTableEnum.MAYOR_MAILBOX.getCode()
+                            .equals(mergeRecord.getString("sourceTable"))) {
+                        String originId = mergeRecord.getString("originId");
+                        if (StrUtil.isNotBlank(originId)) {
+                            originIds.add(originId);
+                        }
+                    }
+                }
+            } catch (Exception e) {
+                log.warn("【局长信箱抓取新信件】解析合并历史失败，已跳过该记录: {}", e.getMessage());
+            }
+        }
+        return originIds;
+    }
+
     // ==================== 单位查询 ====================
 
     /**