Precipitation filter tank

The utility model relates to a sediment filtering basin, including: pond body, mud collecting tank, sludge discharge system, water inlet pipe and effluent weir, the mud collecting tank is provided in pond body bottom, the cross section of mud collecting tank is bucket-shaped, the sludge discharge system is correspondingly provided in the mud collecting tank bottom, the water inlet pipe extends from the outside to pond body center, and the effluent weir is provided with the water outlet weir. And the effluent weir is arranged in the tank body and is positioned above the water outlet of the water inlet pipe. The cross section of the sludge collection tank at the bottom of the tank body of the sedimentation and filtration tank is bucket-shaped, so that sludge is effectively, smoothly and automatically settled at the bottom of the sludge collection tank, and then is pumped out through the sludge discharge system at the bottom of the sludge collection tank, so that the sewage discharge capacity of the sedimentatio