Legendary Weapons of China is a martial arts fantasy film taking place during the late Qing Dynasty when Empress Dowager Cixi dispatches her agents to various factions of the Boxer Rebellion in order find supernatural martial artists that are invulnerable to western bullets. When one of the leaders of these groups disbands his forces, assassins from the remaining factions are sent out to kill him.

The Yangs are betrayed by a government official conspiring with the Mongols. All of the Yang family males except the 5th and 6th brother are killed. Fu Sheng loses his mind after the death of his family, while the other brother takes refuge in a Buddhist temple.

Cheng, a beautiful martial arts ace, battles to keep her inheritance from the ruthless Yun Wei, but her efforts are sabotaged by Yu Tao, her wayward and irrepressible great-nephew. Following a frenzy of spectacular comic mishaps, the hapless duo are setup and imprisoned and the deeds to Cheng's estate are stolen. She is held hostage after a doomed attempt to reclaim the papers back from Yu Wei's place, and the stage is set for a savage fight to the death.