Lam Sai Wing (Sammo Hung), a.k.a. Butcher Wing, is a student of Wong Fei Hung (Kwan Tak Hing). Butcher Wing's long-lost brother Lam Sai-kwong (Chiang Kam) comes to town with his beautiful bride Yuet Mei (Tong Jing). Ko Tai-Hoi (Fung Hak-on), the son of Master Ko (Lee Hoi-Sang), sees Yuet Mei and, lusting for her, abducts her. The abduction is witnessed by Master Ko's goddaughter Lan Hsing.
Wong Fei Hung goes out of town, leaving Butcher Wing and the other disciples, including Leung Foon Yuen Biao and Chik (Wei Pai), to fend for themselves.
Sai-kwong assaults Tai-Hoi, threatening to murder him if he doesn't free Yuet Mei. Butcher Wing arrives and witnesses Sai-kwong beating Tai-Hoi. Not recognizing Sai-kwong, Butcher Wing stops him and drives him off. A despondent Sai-kwong decides to commit suicide but is saved by the wily drunkard Beggar So (Fan Mei-Sheng), an old friend of Wong Fei Hung with equally good kung fu skills. Sai-kwong explains his situation to Beggar So. Beggar So confronts Tai-Hoi, who claims that Butcher Wing took Yuet Mei. Beggar So confronts Butcher Wing, accusing him of abducting his brother's wife. Butcher Wing asks to meet this supposed brother of his. Beggar So introduces Butcher Wing to Sai-kwong, and they realize who each other are. Butcher Wing, Sai-kwong, and Beggar So realize that Tai-Hoi still has Yuet Mei.
Lan Hsing attempts to rescue Yuet Mei but is caught by Tai-Hoi, who holds Lan Hsing captive as well.
Butcher Wing and Beggar So unite and free Yuet Mei from Tai-Hoi's clutches. They also free Lan Hsing, assuming that she's just another of Tai-Hoi's captives and not realizing that she's Master Ko's goddaughter. She keeps her identity secret. They go to Butcher Wing's house. Butcher Wing unwittingly insults Lan Hsing, who decides to punish him. Beggar So drinks too much alcohol and loses consciousness. For the sake of inconveniencing Butcher Wing, Lan Hsing insists on staying at his house that night, claiming to be homeless and feigning an injury that leaves her unable to walk. She climbs into his bed. Beggar So awakens. Butcher Wing invites Beggar So out for more drinks to stop him from noticing that Lan Hsing is in Butcher Wing's bed, and they leave. Tai-Hoi breaks into Butcher Wing's house and attempts to rape Lan Hsing. She resists, screaming, and while trying to silence her, Tai-Hoi accidentally kills her. The murder is overheard by a passing night watchman. Tai-Hoi flees, unknowingly leaving behind an identifying ring, which the night watchman finds.
Tai-Hoi accuses Butcher Wing of the murder. Believing that Butcher Wing will take refuge at Po Chi Lam (Wong Fei Hung's school), Master Ko goes there with two of his students and destroys Po Chi Lam's sign. Leung Foon and Chik attack Master Ko and his students. Butcher Wing arrives during the fight, and Master Ko fatally injures him. Leung Foon and Chik take the dying Butcher Wing to Beggar So, who successfully treats his injuries and critiques his kung fu. Lam Sai Wing asks the old man to teach him how to improve his kung fu. He is made to undergo rigorous training.
The night watchman attempts to extort Tai-Hoi, selling the ring back to him. Tai-Hoi attempts to murder the night watchman, who flees. The night watchman encounters Sai-kwong and Yuet Mei and tells them that Tai-Hoi was Lan Hsing's murderer. Tai-Hoi then catches up and murders the night watchman and Sai-kwong. Yuet Mei escapes with the ring, which she gives to Butcher Wing. She tells him everything.
Later, Butcher Wing crashes a private party that Tai-Hoi is holding on a rented boat. Butcher Wing walks in holding Sai-kwong's funeral tablet. He announces his intent to murder Tai-Hoi to avenge Sai-kwong, then attacks. Everyone but Tai-Hoi flees. Tai-Hoi fights back, but Butcher Wing proves himself the superior fighter. Tai-Hoi tries to flee, but Butcher Wing stops him. Finally Tai-Hoi begs for mercy, groveling on the floor and bowing to Sai-kwong's funeral tablet. Butcher Wing strikes Tai-Hoi in the head with the funeral tablet, killing him.
Master Ko sets up Tai-Hoi's funeral in the town square and waits for Butcher Wing, who will come that way. When Butcher Wing comes, Master Ko attempts to murder him. Butcher Wing fights back, using Tai-Hoi's funeral tablet against Master Ko. The funeral tablet breaks. Even more infuriated, Master Ko redoubles his attack. With help from Beggar So, Butcher Wing beats Master Ko into submission. Just then, Wong Fei Hung returns. The film ends with a joke as Wong Fei Hung prepares to punish Butcher Wing for incorrectly replacing Po Chi Lam's broken sign.