diff --git a/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/service/task/BpmTaskServiceImpl.java b/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/service/task/BpmTaskServiceImpl.java
index a09f48e49c..a02c945fcc 100644
--- a/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/service/task/BpmTaskServiceImpl.java
+++ b/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/service/task/BpmTaskServiceImpl.java
@@ -647,6 +647,13 @@ public class BpmTaskServiceImpl implements BpmTaskService {
                 if (approveUserSelectAssignees == null) {
                     approveUserSelectAssignees = new HashMap<>();
                 }
+                // 当多实例任务根据'审批人自选'策略多次选择时，避免审批人被后一次选择覆盖
+                List<Long> nodeHadAssignees = approveUserSelectAssignees.get(nextFlowNode.getId());
+                if (nodeHadAssignees != null){
+                    assignees = Stream.concat(nodeHadAssignees.stream(), assignees.stream())
+                            .distinct()
+                            .toList();
+                }
                 approveUserSelectAssignees.put(nextFlowNode.getId(), assignees);
                 Map<String,List<Long>> existingApproveUserSelectAssignees = (Map<String,List<Long>>) variables.get(
                         BpmnVariableConstants.PROCESS_INSTANCE_VARIABLE_APPROVE_USER_SELECT_ASSIGNEES);