本片是《新精武门》的续集。牛皮(陈百祥 饰)为刘晶(周星驰 饰)在擂台上的英姿折服,自此苦缠拜师,却引起小敏(张敏 饰)对刘晶误会。刘晶获得的巨额奖金被师父们全部输光,更卷入了潇洒(钟镇涛 饰)与一女孩的纠葛,小敏对他的误会也日益加深,刘晶运气一时衰到了极点。 阿威之大哥横刀(元华 饰)为替弟报仇,将刘晶的神力右手打残,幸有牛皮之姑牛牡丹(萧芳芳 饰)危急关头蒙面救走刘晶。于是刘晶在牛家休养,邂逅和小敏相貌一样的牛皮表妹——婉君(张敏 饰),不久横刀找上门来,将牛皮与婉君掳走,牛牡丹为保住牛家血脉,只得将牛家祖传的“电角神拳”传授于刘晶……After the total defeat of Cheung Wai (Ming Wan Yeueng) in a boxing match with Lau Ching (Stephen Chow), his brother Cheung Wan To (Wah Yuen) and his gang are out to seek revenge against Ching. When Ching and his wannabe apprentice Ngou Pi (Pak-cheung Chan) were ambushed by Wan To and his gang in the streets, they are saved by a masked caper. Ching then seeks refuge in Ngou Pi's home and meets his feisty sister, Ngou Chat (Josephine Siao), who is later revealed to be the caper. They are later challenged by Wan To to a boxing match to settle the score and, as a result, forces Ching to learn new fighting skills.