The invention belongs to the technical field of motorcycle crash protective clothing, equestrian falling protective clothing, mountaineering protective clothing, marine nautical life jackets and air charging products and equipment, in particular relates to an actuator of an air charging system. The actuator of the air charging system comprises an air bottle, a baffle, a shell, a spring fixing nut and an actuating device, and the actuating device comprises an ejector pin main body, a spring, a drawstring turning member, a drawstring clamping member and a drawstring. According to the actuator of the air charging system, the clothing can be charged with air quickly; detachment of the entire device can be achieved through the nut, detachment is convenient, all members and parts are individually detachable and replaceable, and production and use costs are reduced; arrangement of air leaking holes can avoid the secondary damage caused by the air to a human body; and the internal structure of the device is reasonable in design, high in safety factor and high in reliability, the complexity of the production process and technology is reduced, and offering services and opening up the market can be better implemented.