Pneumatic clamp butterfly valve, butterfly valve equipped with pneumatic actuator. The execution speed of pneumatic actuators is relatively fast and does not require manual labor, which greatly saves human resources and time. The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the initial position of the valve is determined according to actual needs. When the valve rotates 90 ° from the initial position, one action ends (from open to close, or from close to open), and vice versa, another action ends (from close to open, or from open to close).