The embodiment of the invention discloses a pneumatic motor, and relates to the technical field of power equipment. The pneumatic motor comprises a machine frame, a rotor, a cylinder body, a swash plate and a paddle rod, wherein the rotor is arranged in the machine frame, and the rotor is provided with a threading hole; the cylinder body is arranged outside the machine frame, an air flow groove isformed in the cylinder body, and an inclined fixed shaft perpendicular to the air flow groove is arranged on the end face of the cylinder body; the depth from the two ends of the air flow groove to the middle of the air flow groove is gradually deepened, and the swash plate is fixed on the inclined fixed shaft; and the paddle rod is slidably arranged in the threading hole, one end of the paddle rod is connected with a fisheye slide rod of the swash plate, and the other end of the paddle rod is located in the air flow groove. The pneumatic motor has the advantages that the working condition issimple, the situations that the sealing becomes poor or invalid, and the pneumatic motor even cannot be started cannot appear, and the output torque and the rotating speed are stable.