Pneumatic quick switch valve

The utility model provides a pneumatic quick switch valve which is characterized in that a valve clack capable of moving up and down is arranged in a valve cavity in a valve body, a valve rod used for controlling the valve clack to move up and down is arranged at the top of the valve clack, a valve cover is arranged at the control end of the valve body, and the valve cover is connected with the control end of the valve body through at least two studs. A valve cover gasket for sealing is arranged at the joint of the bottom of the valve cover and the valve body; when quick and instant opening is carried out, control gas is inflated into the air cylinder, a telescopic rod of the air cylinder drives the valve rod to move upwards, the valve clack is separated from a sealing area of a valve cavity in the valve body, and opening operation is completed. When quick and instant cut-off is carried out, control gas is inflated into the air cylinder, a telescopic rod of the air cylinder pushes the valve rod to move downwa