The working principle of the rotary long stroke rodless cylinder is similar to that of the hydraulic rotary low profile rodless air cylinder. The compressed air enters from the input port A of pneumatic rodless actuators, and is divided into two paths after entering rodless. One path enters the bottom of the blade through the grooves on the sealing covers at both ends of the stator, pushing the blade into the stator; the other path enters the crescent-shaped closed space composed of the blade, stator, rotor and the sealing covers at both ends, and acts on the blades on both sides of the studio, generating a force to rotate the rotor.