强龙不压地头蛇（强龍不壓地頭蛇）　

◎ 强龙不压地头蛇 qiánglóng bù yā dìtóushé

[one with great power cannot defeat a local villain] 比喻外来的势力斗不过当地的恶势力

自古强龙不压地头蛇。——清· 孔尚任《桃花扇》