韦小宝（梁朝伟）为人刁钻聪敏，因义气帮助天地会人打退清兵后，他于稀里胡涂中接受天地会命令进宫“成了”太监。结识少年皇帝康熙（刘德华）时，不识对方身份的韦小宝与之不打不相交结成莫逆之友，并因在得知其身份后协助他铲除奸臣成为宫中红人。 韦小宝无意知晓太后是神龙教人所假扮，目的是盗取藏有清朝秘密的四十二章经后，上报康熙，在他的帮助下，康熙救出被囚禁长达十多年的太后，其后韦小宝巧设妙计令顺治与康熙父子团聚，又挑拨神龙教人自相残杀，令康熙对他更加器重，然而他天地会人的身份终没瞒过康熙双眼。此外，周旋于先后爱上的建宁、双儿等七个女人之间，也令韦小宝觉得日子没那么好混。It is the early years of the Manchu (Qing) empire and the new Emperor (Andy Lau) needs all the help he can get from Tony Leung. Tony plays a double-dealing rogue who is never quite sure whose side he is really on, the Manchu emperor, or the Ming loyalists who want China to be ruled by the Chinese. Literal English title is "The Duke of Mountain Deer".
