王无忌是清末大刀王五的幼子，王五因救谭嗣同而遭清帮魔头练辟邪杀害，其家人亦一同被杀，仅无忌幸免于难，随醉乞学习醉拳。 　　无忌长大后，出为江湖行走，遇到许多事情，首先被卷入盗慈禧墓的事件中，与邪派人物发生冲突，又因要报杀父之仇，杀练避邪，无忌得机拜剑仙为师学艺，并邂逅仙儿及醉娃 ，与剑仙之子小剑仙成为好友，四个青年侠士之间，发生了一段动人的情场追逐战，形成纠缠不清的情仇恩怨，英雄气短，儿女情长。 　　无忌屡遇风险，在江湖上，历尽各种磨练，培养出坚毅不移的性格，同时他为人正义，大仁大勇，很得正派武林人士看重，亦得到魔仙之女的垂青，可惜他身负大仇，一心要手刃杀父仇人，致难以兼顾爱情，令内心添了不少苦恼！

In the final years of the Qing Dynasty, famous kung fu master "Big Saber" Wang Wu (Eddy Ko) falls to the invincible martial arts of evil cult leader Lian Bixie (Wong Lung Wai), and has all of his family killed except for his young son Wuji. Bearing the vendetta, Wuji (Ng Kong) grows up a disciple of the Drunken Beggar (Tso Tat Wah). With his supreme "Drunken Fist" kung fu, the righteous and brave young man roams the martial world and has numerous dangerous encounters with the most vicious villains. He is also romantically entangled with Xian'er (Moon Lee), Drunken Babe (Yip Yuk Ping), and his best friend, the Little Sword Immortal (Lau Kar Yung)