The invention discloses a control method of an air compressor and belongs to the technical field of electric vehicle manufacturing. The control method comprises the steps of A, when pressure in an airstorage tank decreases to a minimum set value of pressure, feeding, by a pressure switch, a signal back to a vehicle controller, and starting, by the vehicle controller, the air compressor to operatethrough the controller; B, when the pressure of the air in the air storage tank increases to a maximum set value of pressure, feeding, by the pressure switch, a signal to the vehicle controller, andstopping, by the vehicle controller, the air compressor operating through the controller; C, controlling, by the vehicle controller, an electromagnetic valve to open so that compressed air in a connection tube is discharged. Compared with the prior art, the control method allows starting and stopping of the air compressor to be accurately controlled via the vehicle controller.