The CCQ series pneumatic ultra-high vacuum plug valve uses compressed air as the power, changes the direction of the air circuit through an electromagnetic directional valve, pushes the cylinder piston, and drives the valve plate to move axially through the transmission rod push (pull) connecting rod mechanism, achieving the opening or closing of the valve plate, thereby achieving the purpose of connecting or cutting off the air flow in the ultra-vacuum system. Reasonable in structural design, beautiful in appearance, and with advantages such as smooth operation, small volume, large flow channel, reliable use, good sealing performance, and long service life, it can be widely used in ultra-high vacuum equipment. The suitable working medium is clean air and non corrosive gases.