Liang Kun is a common laborer who seeks only a quiet life, but when three fighters show up the trouble begins. Working for a greedy merchant who seeks to take over the trade routes passing through town, the three thugs begin a campaign of terror and intimidation. Liang Kun's boss stands up to them and is killed, but not before passing the secret of his fighting technique: Iron Kung Fu. Aided by a stranger wh seeks to bring the villainous merchant to justice, Liang Kun must fight to save his life and livelihood.