Sealing structure of pneumatic spray valve

The utility model belongs to the technical field of spraying valves, and particularly relates to a pneumatic spraying valve sealing structure which comprises a valve body, a main shaft, a reciprocating structure and a spraying head, the main shaft is installed inside the valve body in a sliding mode, the reciprocating structure is installed at the upper end of the main shaft, the spraying head is installed at the lower end of the main shaft, and the valve body comprises an upper valve body and a lower valve body. The upper valve body is detachably connected with the lower valve body, a valve cavity is formed in the upper valve body, a liquid inlet used for being connected with a liquid supply pipeline in a communicating mode is formed in one side of the valve cavity, the interior of the main shaft is hollow, a liquid guide hole is formed in the inner wall of the main shaft, a first sealing structure is arranged between the upper valve body and the main shaft, and a second sealing structure is arranged between