Automatic vertical back washing device

The utility model relates to an automatic vertical back washing device, which comprises a cylinder body with a water inlet, a water outlet and a sewage outlet and a filter screen mounted in the cylinder body. The back washing device is characterized in that the device adopts the vertical design, the water inlet is formed at the lower part of the wall of the cylinder body and provided with a water inlet valve; the water outlet is formed at the upper part of the wall of the cylinder body and provided with a water outlet valve; the sewage outlet is formed at the lower part of the cylinder body and on the other side corresponding to the water inlet and provided with a sewage valve; the cylinder body is sealed and assembled with a cylinder cover, a back washing mouth is formed in the center of the cylinder cover and provided with a back washing mouth valve; the filter screen adopts the detachable double-layered compound filter screen, the non-woven fabrics is filled and lined between double-layered filter screens,