diff --git a/klp-wms/src/main/java/com/klp/controller/WmsCoilContractRelController.java b/klp-wms/src/main/java/com/klp/controller/WmsCoilContractRelController.java
index 917956af6..f93ead442 100644
--- a/klp-wms/src/main/java/com/klp/controller/WmsCoilContractRelController.java
+++ b/klp-wms/src/main/java/com/klp/controller/WmsCoilContractRelController.java
@@ -85,6 +85,18 @@ public class WmsCoilContractRelController extends BaseController {
         return toAjax(iWmsCoilContractRelService.updateByBo(bo));
     }
 
+    /**
+     * 批量修改钢卷所挂接的合同
+     */
+    @Log(title = "钢卷与合同关联关系", businessType = BusinessType.UPDATE)
+    @RepeatSubmit()
+    @PutMapping("/batchUpdateContract")
+    public R<Integer> batchUpdateContract(@NotNull(message = "合同ID不能为空") @RequestParam Long contractId,
+                                          @NotEmpty(message = "钢卷ID列表不能为空") @RequestBody List<Long> coilIds) {
+        int updated = iWmsCoilContractRelService.batchUpdateContractId(contractId, coilIds);
+        return R.ok(updated);
+    }
+
     /**
      * 删除钢卷与合同关联关系
      *
diff --git a/klp-wms/src/main/java/com/klp/service/IWmsCoilContractRelService.java b/klp-wms/src/main/java/com/klp/service/IWmsCoilContractRelService.java
index f4f40b299..95d8eb468 100644
--- a/klp-wms/src/main/java/com/klp/service/IWmsCoilContractRelService.java
+++ b/klp-wms/src/main/java/com/klp/service/IWmsCoilContractRelService.java
@@ -46,4 +46,13 @@ public interface IWmsCoilContractRelService {
      * 校验并批量删除钢卷与合同关联关系信息
      */
     Boolean deleteWithValidByIds(Collection<Long> ids, Boolean isValid);
+
+    /**
+     * 批量修改钢卷挂接的合同：校验 coilIds 在关联表中是否存在，存在则批量更新 contractId
+     *
+     * @param contractId 目标合同ID
+     * @param coilIds    钢卷ID列表
+     * @return 实际更新的记录数
+     */
+    int batchUpdateContractId(Long contractId, List<Long> coilIds);
 }
diff --git a/klp-wms/src/main/java/com/klp/service/impl/WmsCoilContractRelServiceImpl.java b/klp-wms/src/main/java/com/klp/service/impl/WmsCoilContractRelServiceImpl.java
index d50fd88c9..c481f7295 100644
--- a/klp-wms/src/main/java/com/klp/service/impl/WmsCoilContractRelServiceImpl.java
+++ b/klp-wms/src/main/java/com/klp/service/impl/WmsCoilContractRelServiceImpl.java
@@ -17,10 +17,13 @@ import com.klp.domain.WmsMaterialCoil;
 import com.klp.mapper.WmsCoilContractRelMapper;
 import com.klp.mapper.WmsMaterialCoilMapper;
 import com.klp.service.IWmsCoilContractRelService;
+import com.klp.common.exception.ServiceException;
 
 import java.util.List;
 import java.util.Map;
 import java.util.Collection;
+import java.util.Collections;
+import java.util.stream.Collectors;
 
 /**
  * 钢卷与合同关联关系Service业务层处理
@@ -147,4 +150,49 @@ public class WmsCoilContractRelServiceImpl implements IWmsCoilContractRelService
         }
         return baseMapper.deleteBatchIds(ids) > 0;
     }
+
+    /**
+     * 批量修改钢卷挂接的合同
+     */
+    @Override
+    public int batchUpdateContractId(Long contractId, List<Long> coilIds) {
+        if (coilIds == null || coilIds.isEmpty()) {
+            return 0;
+        }
+        // 校验哪些 coilId 在当前关联表中存在
+        LambdaQueryWrapper<WmsCoilContractRel> queryWrapper = Wrappers.lambdaQuery();
+        queryWrapper.in(WmsCoilContractRel::getCoilId, coilIds);
+        List<WmsCoilContractRel> existList = baseMapper.selectList(queryWrapper);
+        List<Long> validCoilIds = (existList == null || existList.isEmpty())
+            ? java.util.Collections.emptyList()
+            : existList.stream().map(WmsCoilContractRel::getCoilId).distinct().collect(Collectors.toList());
+        // 找出不存在的 coilId，查询其钢卷号并抛出异常
+        List<Long> missingCoilIds = coilIds.stream()
+            .filter(id -> !validCoilIds.contains(id))
+            .collect(Collectors.toList());
+        if (!missingCoilIds.isEmpty()) {
+            LambdaQueryWrapper<WmsMaterialCoil> coilQuery = Wrappers.lambdaQuery();
+            coilQuery.in(WmsMaterialCoil::getCoilId, missingCoilIds);
+            coilQuery.select(WmsMaterialCoil::getCurrentCoilNo);
+            List<WmsMaterialCoil> missingCoils = coilMapper.selectList(coilQuery);
+            List<String> missingCoilNos = missingCoils.stream()
+                .map(WmsMaterialCoil::getCurrentCoilNo)
+                .filter(StringUtils::isNotBlank)
+                .collect(Collectors.toList());
+            throw new ServiceException(
+                "以下钢卷在当前关联表中不存在，无法批量修改合同：" + String.join(", ", missingCoilNos));
+        }
+        // 批量更新 contractId
+        LambdaUpdateWrapper<WmsCoilContractRel> updateWrapper = Wrappers.lambdaUpdate();
+        updateWrapper.set(WmsCoilContractRel::getContractId, contractId)
+            .in(WmsCoilContractRel::getCoilId, validCoilIds);
+        int updated = baseMapper.update(null, updateWrapper);
+        // 同步钢卷业务员信息
+        if (updated > 0) {
+            for (Long coilId : validCoilIds) {
+                syncCoilSaleName(coilId, contractId);
+            }
+        }
+        return updated;
+    }
 }