我国南派拳术源远流长，其中咏春拳身在佛山的传人梁赞（梁家仁 饰）精通医术，为人仗义，乡间有口皆碑。梁赞有徒肥春（洪金宝 饰），性格憨厚常受人捉弄。肥春好友找钱华（卡萨伐 饰）在莫记钱庄担任出纳，平时好打抱不平。是日，一伙江洋恶徒来到佛山，与莫记老板莫老庆接头，一干匪徒为抢夺权利，筹划杀死镇长，却正好为找钱华偷听到。找钱华向镇长报信，不料被莫老庆一伙发觉，连累老母身亡，找钱华本人身负重伤，幸有肥春搭救。莫老庆担心梁赞出手阻拦，投鼠忌器，而找钱华为报仇在肥春的帮助下拜梁赞为师，苦学咏春欲一雪深仇，正邪交锋即将展开……Beloved for its combination of thrilling combat choreography and hilarious physical comedy, the film tells the story of a humble cashier who discovers a plot to kill his small town mayor.