"Human Cannon 2" tells the story of a "promising youth" cannon in the countryside of Northeast China who aspires to get ahead, and accidentally resolves a small war, but also inadvertently lets go of a chemical weapons expert of the Japanese army. After receiving patriotic education, the cannon and the patriots launched a decapitation operation against Japanese chemical weapons experts. In order to successfully consummate the marriage, how will the artillery escape from the control of the police, and how will it defuse the war and fight against Japanese chemical weapons experts with patriots? The answer to everything is in the film.