"得赌(dǔ )神(shén )毕(bì )生(shēng )绝技的刀仔（刘德华）在龙五（向华(huá )强）的陪同下(xià )重出(chū )江湖，代表(biǎo )师父以赌技致力(lì )慈善事(shì )业，人称赌侠。遇到欲拜(bài )赌神为师号称赌圣的阿星（周星驰）后，两人互展计谋(móu )绝技，打成平(píng )手。