diff --git a/src/main/java/Mua/Mua_backend/domain/comment/entity/Comment.java b/src/main/java/Mua/Mua_backend/domain/comment/entity/Comment.java
index c050580..10707fa 100644
--- a/src/main/java/Mua/Mua_backend/domain/comment/entity/Comment.java
+++ b/src/main/java/Mua/Mua_backend/domain/comment/entity/Comment.java
@@ -114,4 +114,8 @@ public void delete() {
         this.isDeleted = true;
         this.description = "삭제된 댓글입니다.";
     }
+
+    public void changeType(CommentType type) {
+        this.commentType = type;
+    }
 }
diff --git a/src/main/java/Mua/Mua_backend/domain/comment/repository/CommentRepository.java b/src/main/java/Mua/Mua_backend/domain/comment/repository/CommentRepository.java
index 3b2958c..8f5f79f 100644
--- a/src/main/java/Mua/Mua_backend/domain/comment/repository/CommentRepository.java
+++ b/src/main/java/Mua/Mua_backend/domain/comment/repository/CommentRepository.java
@@ -4,10 +4,13 @@
 import org.springframework.data.jpa.repository.JpaRepository;
 
 import java.util.List;
+import java.util.Optional;
 
 public interface CommentRepository extends JpaRepository<Comment, Long> {
 
     List<Comment> findByFeedIdOrderByCreatedAtAsc(Long feedId);
 
     List<Comment> findByParentIdOrderByCreatedAtAsc(Long parentId);
+
+    Optional<Comment> findByParticipationId(Long participationId);
 }
\ No newline at end of file
diff --git a/src/main/java/Mua/Mua_backend/domain/comment/service/CommentService.java b/src/main/java/Mua/Mua_backend/domain/comment/service/CommentService.java
index 77e380c..4b4c617 100644
--- a/src/main/java/Mua/Mua_backend/domain/comment/service/CommentService.java
+++ b/src/main/java/Mua/Mua_backend/domain/comment/service/CommentService.java
@@ -119,4 +119,13 @@ public void deleteComment(Long commentId, Long memberId) {
 
         comment.delete();
     }
+
+    // 참가 승인, 거절에 따른 댓글 상태변환
+    public void updateEventComment(Long participationId, CommentType type) {
+
+        Comment comment = commentRepository.findByParticipationId(participationId)
+                .orElseThrow(() -> new IllegalArgumentException("댓글이 존재하지 않습니다."));
+
+        comment.changeType(type);
+    }
 }
diff --git a/src/main/java/Mua/Mua_backend/domain/participation/service/ParticipationService.java b/src/main/java/Mua/Mua_backend/domain/participation/service/ParticipationService.java
index 3371486..4c659ea 100644
--- a/src/main/java/Mua/Mua_backend/domain/participation/service/ParticipationService.java
+++ b/src/main/java/Mua/Mua_backend/domain/participation/service/ParticipationService.java
@@ -95,12 +95,8 @@ public void approve(Long participationId, Member writer) {
         Member applicant = participation.getApplicant();
         Feed feed = participation.getFeed();
 
-        String message = applicant.getNickname() + "님의 참가가 승인되었습니다.";
-
-        commentService.createEventComment(
-                feed.getId(),
+        commentService.updateEventComment(
                 participation.getId(),
-                message,
                 CommentType.APPROVE
         );
 
@@ -125,12 +121,8 @@ public void reject(Long participationId, Member writer) {
         Member applicant = participation.getApplicant();
         Feed feed = participation.getFeed();
 
-        String message = applicant.getNickname() + "님의 참가가 거절되었습니다.";
-
-        commentService.createEventComment(
-                feed.getId(),
+        commentService.updateEventComment(
                 participation.getId(),
-                message,
                 CommentType.REJECT
         );