Pneumatic thin film single seat regulator adopts the top guide structure, the valve structure is compact, has a streamlined S channel, so that the pressure drop loss is small, large flow, wide adjustable range, high accuracy of flow characteristics, in line with IEC534-1 related standards. The leakage of the regulator meets the new ANSI B16.104 standard. The regulator is equipped with a multi-spring film actuator, which has a compact structure and large output force.