在这部摩登保镖喜剧片中,邓小龙（许冠英 饰）从小就为人正直、乐于助人，他的志愿就是长大了能当一名除暴安良的好警察。无奈天意弄人，他因身材矮小，而且天生色盲，于是被警局拒之了门外，他只好去保安公司当了一名护卫员。保安主管周世昌（许冠文 饰）是一名老油条，为人尖酸刻薄、贪生怕死。下属阿Sam（许冠杰 饰）一早就看他不顺眼，只是有冤无处申。
这次，公司的太子王平凡从国外留学回来，假扮保安混进了公司考察情况。不久阿Sam和小龙就因工作出色而获得提拔，而周世昌却被剥夺了主管之位降职任用，还有几个月就可以退休享受的他会为了退休金忍下这口恶气还是会另有所谋？
Chou Sai-Cheong. a bitter supervisor of a Hong Kong private security company, teaches unusual guard tactics to new recruits such as electric mats, parachuting off burning buildings and counter-attacking gunfire. He was secretly observed by his new boss (Stanley Fung) and, unimpressed by his work, the new boss demotes Chou and promotes Chou's assistant Sam (Sam Hui). Under the leadership of Sam, Chou and new recruit Bruce Tang (Ricky Hui) encounter a slew of misadventures, including pursuing stowaways on a party boat. Bruce ultimately falls in love with one of the stowaways. Finally, they all get entangled in a plot to steal one of China's most prized treasures on display in Hong Kong, and in a plot involving some missing government money that the security officers were guarding.
香港就像一条小船，负担太重，多几个人就沉了。许氏三杰的电影告一段落，一个真辉煌的时代～。很生活，很摩登。。最佳男主。你可能需要一部喜剧续续命！。三个保镖与两杆大烟枪。关注现实中小人物的电影。《摩登保镖》 2018.01.30。存在。摩登保镖。
