Mechanical automatic backwashing sewage treatment device

The utility model belongs to the technical field of sewage treatment, and particularly relates to a mechanical automatic backwashing sewage treatment device. The whole device is of a box structure andis divided into a water purifying part, a filtering treatment part and a liquid level differential pressure backwashing control part, wherein a punched plate is arranged between the water purifying part and the filtering treatment part, the upper part of the punched plate is the water purifying part, and the lower part is the filtering treatment part; the liquid level differential pressure backwashing control part is arranged on the side wall of the box body; an overflow port is formed in the top of the box body; a water inlet is formed in the lower part of the box body; and a plurality of water permeable holes are formed in the punched plate and the plate body. The automatic sewage treatment device provided by the utility model is ingenious in structural design, mechanical automatic backwash can be realized in t