Abstract: The present disclosure provides a swimming auxiliary equipment, including an auxiliary equipment main body, a strap, a connecting belt and two arm jackets, wherein two sides of the auxiliary equipment main body are tied to the waist of a swimmer through the strap, and the arm jackets are connected to the auxiliary equipment main body through the connecting belt; the auxiliary equipment main body includes a first air bag, a cavity is arranged inside a waterproof layer, the first air bag is arranged in the cavity, and a pressure sensor is arranged on an inner wall of the auxiliary equipment main body; and the auxiliary equipment main body includes an expansion bin arranged in the cavity and a net structure with a plurality of connected layers, a priming device is arranged on the net structure, and the priming device is arranged in the cavity and connected to the pressure sensor.