Driving type decompression valve capable of automatically adjusting high-accuracy stepping motor

The invention relates to the technical field of decompression valves of a fuel cell power generation system and further discloses a driving type decompression valve capable of automatically adjusting a high-accuracy stepping motor. The stepping motor is fixed at the upper end of an upper casing in the driving type decompression valve, a stepping motor shaft on the stepping motor extends into the upper casing and connected with a spring device in the upper casing, an air outlet through hole and an air inlet through hole are arranged on a lower casing, a valve core and an auxiliary spring at the lower end of the valve core are sequentially arranged at the center of the lower casing, the air outlet through hole and the air inlet through hole are separated through a sealing pad and a valve core, the upper casing fixedly presses a membrane on the lower casing, and the spring device on the upper casing can push the valve core to move vertically through the membrane. By automatically adjusting and controlling on pre