The invention discloses a respiratory muscle rehabilitation training device and a using method thereof. The device comprises a pressing plate, a lead screw and a clamping plate assembly, an air bag cushion is installed on the lower surface of the pressing plate, a branch pipe is arranged on the upper surface of the pressing plate, an air pipe is installed in the middle of the branch pipe, a gas flow meter is connected to the middle of the air pipe, a mask is installed at the end, away from the gas flow meter, of the air pipe, the rear side of the mask is connected with an elastic band, the left and right ends of the pressing plate are connected with one ends of connecting rods, a connecting plate is installed at the other ends of the connecting rods, a fixed plate is arranged on the sides,away from the connecting rods, of the connecting plate, a ball seat is fixed to one side, away from the connecting plate, of the fixed plate, the lead screw penetrates through the interior of the ball seat, the lower end of the lead screw is connected with a servo motor, and the clamping plate assembly is installed below the servo motor. A breathing method and a diaphragm pacing method are effectively combined for use, the practicability is higher, and the training effect is better.