在这部龙父虎子喜剧片中,袁金宝（洪金宝饰）是杰出拳击手，当拳击生涯达巅峰时，其妻（蔡佳宏饰）弃父子而他去，宝经此打击，沉迷醉乡游手好闲，皓皓随宝过着穷困潦倒不右温饱的日子，而成为鬼灵精，父子俩联手诈骗钱财。
某日张警官（吴君如饰）诱宝出动，当场人赃俱获,逮入牢房，皓顿落单，张怜悯收留回家，暂解聘请保姆难题。张子——比利小子和皓皓一见如故，皆怀鬼胎，巧意撮合袁父与张，孰料两人似仇，处处刁难对方。
直到某夜,皓一语惊醒宝，使宝彻底改头换面重新做人，准备再展拳术。透过经纪人（庹宗华饰）力拜，使宝再度活跃拳坛，皓之真情打动，使宝和张渐消敌意，和平相处，就在这时皓母突然出现，张无奈只好和比利小子依依难舍而离开，这时的宝又于拳坛节节获胜。
警局里一张仍以一贯的呐喊声为嫌疑犯拍照存档，见宝带着皓拿着鲜花来局里求婚，张动情破涕为笑，却使得双方都有拖油瓶的有情人终成眷属。
Sammo is a single father / scam artist that uses his son in his scams. He's an alcoholic with gambling problems that likes to fight. He gets arrested and the woman who arrests him looks after his son while he's in jail.
