Sealing structure of high-pressure gas switch valve

The utility model relates to a high-pressure gas switch valve sealing structure which comprises a valve seat, a shell, a valve rod and a limiting sleeve, a gas inlet channel is formed in the shell, the valve rod is installed in a valve rod installation hole of the limiting sleeve, a limiting ring is arranged on the outer circle of the lower end of the valve rod, the valve seat is installed in the shell, and a gas outlet channel is formed in the valve seat. Outer sealing surfaces are arranged at the lower ends of the air outlet channels; the air inlet channel is normally communicated with the high-pressure cavity, and the high-pressure cavity is selectively communicated with the air outlet channel; a sealing rod is mounted in a sealing rod mounting hole of the valve rod, part of the sealing rod upwards protrudes out of the upper end face of the valve rod, and the side face, protruding out of the upper end face of the valve rod, of the sealing rod is an inner sealing face; when the lower end face of the valve s