Pneumatic speed regulating valve with self-locking function

The pneumatic speed regulating valve with the self-locking function comprises a valve body, an execution unit top cover and an air inlet pipe, the execution unit top cover is arranged at the top end of the valve body, one side of the valve body is fixedly connected with the air inlet pipe, the bottom end of the valve body is fixedly connected with an auxiliary screw rod, and a sealing structure is arranged at the top end of the outer side wall of the auxiliary screw rod. The guide grooves are formed in the upper portions of the interiors of the two ends of the valve body, and an auxiliary butt joint structure is arranged in the air inlet pipe. The self-locking structure is arranged, the execution unit top cover is pressed to extend into the valve body, the reset spring is pressed to push parts such as the valve element in the valve body, and therefore the fluid flowing space in the valve body is reduced, and then the execution unit top cover is screwed along the guide groove to enable the guide rod to slide a