Pneumatic reversing valve

The utility model discloses a pneumatic reversing valve, which belongs to the field of reversing valves and comprises a shell, an air cylinder is mounted at the bottom end of the shell, a support is connected to the bottom end of the air cylinder, an upper valve body is connected to one end, far away from the air cylinder, of the support, a lower valve body is connected to the bottom end of the upper valve body, and a clamp is sleeved at the joint of the support and the upper valve body. The joint of the upper valve body and the lower valve body is also sleeved with a hoop, the bottom end of the lower valve body is communicated with a first liquid outlet, the side end of the upper valve body is communicated with a second liquid outlet, the side end of the lower valve body is communicated with a liquid inlet, a check block is fixed in the shell, a connecting rod is arranged at the bottom end of the check block, and the connecting rod penetrates through the air cylinder, the support, the upper valve body and th