diff --git a/src/main/java/com/gg/server/admin/tournament/service/TournamentAdminService.java b/src/main/java/com/gg/server/admin/tournament/service/TournamentAdminService.java
index 331975f13..51018a1cf 100644
--- a/src/main/java/com/gg/server/admin/tournament/service/TournamentAdminService.java
+++ b/src/main/java/com/gg/server/admin/tournament/service/TournamentAdminService.java
@@ -91,19 +91,6 @@ public Tournament updateTournamentInfo(Long tournamentId, TournamentAdminUpdateR
         return tournamentRepository.save(targetTournament);
     }
 
-    /***
-     * 토너먼트 게임 테이블 생성 Method
-     * @param tournament 토너먼트 게임에 매칭될 토너먼트
-     * @param cnt 토너먼트 전체 라운드 수
-     */
-    private void createTournamentGameList(Tournament tournament, int cnt) {
-        TournamentRound[] rounds = TournamentRound.values();
-        while (--cnt >= 0) {
-            TournamentGame tournamentGame = new TournamentGame(null, tournament, rounds[cnt]);
-            tournament.addTournamentGame(tournamentGame);
-        }
-    }
-
     /**
      * <p>토너먼트 삭제 매서드</p>
      * <p>토너먼트는 BEFORE 인 경우에만 삭제 가능하다.</p>
@@ -117,8 +104,6 @@ public void deleteTournament(Long tournamentId) {
         if (targetTournament.getStatus() != TournamentStatus.BEFORE) {
             throw new TournamentUpdateException("already started or ended", ErrorCode.TOURNAMENT_NOT_BEFORE);
         }
-        List<TournamentGame> tournamentGameList = tournamentGameRepository.findAllByTournamentId(targetTournament.getId());
-        tournamentGameRepository.deleteAll(tournamentGameList);
         tournamentRepository.deleteById(tournamentId);
     }
 
@@ -185,6 +170,19 @@ public void deleteTournamentUser(Long tournamentId, Long userId) {
         tournamentUserRepository.delete(targetTournamentUser);
     }
 
+    /***
+     * 토너먼트 게임 테이블 생성 Method
+     * @param tournament 토너먼트 게임에 매칭될 토너먼트
+     * @param cnt 토너먼트 전체 라운드 수
+     */
+    private void createTournamentGameList(Tournament tournament, int cnt) {
+        TournamentRound[] rounds = TournamentRound.values();
+        while (--cnt >= 0) {
+            TournamentGame tournamentGame = new TournamentGame(null, tournament, rounds[cnt]);
+            tournament.addTournamentGame(tournamentGame);
+        }
+    }
+
     /**
      * 토너먼트 시간 체크 :
      * [ 현재 시간 + 최소 2일 ],
diff --git a/src/main/java/com/gg/server/domain/tournament/data/Tournament.java b/src/main/java/com/gg/server/domain/tournament/data/Tournament.java
index 20a2ccf40..a447abd15 100644
--- a/src/main/java/com/gg/server/domain/tournament/data/Tournament.java
+++ b/src/main/java/com/gg/server/domain/tournament/data/Tournament.java
@@ -52,10 +52,10 @@ public class Tournament extends BaseTimeEntity {
     @JoinColumn(name = "winner_id")
     private User winner;
 
-    @OneToMany(mappedBy = "tournament", cascade = CascadeType.PERSIST)
+    @OneToMany(mappedBy = "tournament", cascade = CascadeType.ALL)
     private List<TournamentGame> tournamentGames = new ArrayList<>();
 
-    @OneToMany(mappedBy = "tournament")
+    @OneToMany(mappedBy = "tournament", cascade = CascadeType.ALL)
     private List<TournamentUser> tournamentUsers = new ArrayList<>();
 
     @Builder
diff --git a/src/main/resources/db/migration/V3__migration_42gg_5th.sql b/src/main/resources/db/migration/V3__migration_42gg_5th.sql
index 22954cbea..b81b2e51b 100644
--- a/src/main/resources/db/migration/V3__migration_42gg_5th.sql
+++ b/src/main/resources/db/migration/V3__migration_42gg_5th.sql
@@ -24,7 +24,9 @@ CREATE TABLE tournament_user (
     created_at      DATETIME NOT NULL,
     modified_at      DATETIME NOT NULL,
     PRIMARY KEY (id),
-    FOREIGN KEY (tournament_id) REFERENCES tournament(id),
+    FOREIGN KEY (tournament_id) REFERENCES tournament(id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE ,
     FOREIGN KEY (user_id)       REFERENCES user(id)
 );
 
@@ -37,6 +39,8 @@ CREATE TABLE tournament_game (
     created_at          DATETIME NOT NULL,
     modified_at          DATETIME NOT NULL,
     PRIMARY KEY (id),
-    FOREIGN KEY (tournament_id) REFERENCES tournament(id),
+    FOREIGN KEY (tournament_id) REFERENCES tournament(id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE ,
     FOREIGN KEY (game_id)       REFERENCES game(id)
 );
diff --git a/src/test/java/com/gg/server/admin/tournament/service/TournamentAdminServiceTest.java b/src/test/java/com/gg/server/admin/tournament/service/TournamentAdminServiceTest.java
index 4cfcc152f..c51bf0756 100644
--- a/src/test/java/com/gg/server/admin/tournament/service/TournamentAdminServiceTest.java
+++ b/src/test/java/com/gg/server/admin/tournament/service/TournamentAdminServiceTest.java
@@ -288,7 +288,6 @@ void success() {
                 getTargetTime(2, 1), getTargetTime(2, 3));
             List<TournamentGame> tournamentGameList = createTournamentGames(1L, tournament, tournamentGameCnt);
             given(tournamentRepository.findById(1L)).willReturn(Optional.of(tournament));
-            given(tournamentGameRepository.findAllByTournamentId(tournament.getId())).willReturn(tournamentGameList);
             // when, then
             tournamentAdminService.deleteTournament(tournament.getId());
         }