Sand washing and separating device for urban sewage treatment plant

The utility model provides a sand washing and separating device for an urban sewage treatment plant, which comprises a draining area, a sand washing area and a collecting area which are connected in sequence, and sand removing and separating nets are driven by transmission devices to circularly flow among the areas in sequence. In the circulation process, the sand removing and separating net receives a mud-sand-water mixture flowing down from the water inlet pipe in the draining area, organic matter attached to the surface of mud sand is washed and removed through washing equipment in the sand washing area, and then residual sand left after washing in the sand separating net is dried and separated in the collecting area. The horizontally arranged transmission device drives the sand removing and separating net to flow in all the areas so as to gradually separate water and impurities in the mud-sand-water mixture through different areas, a carbon source attached to mud sand can be reserved in circulating water,