Domestic sewage processing system with anaerobic-aerobic combined biological filter

A domestic sewage processing system with anaerobic-aerobic combined biological filter relates to a domestic sewage processing system. The invention solves the problems of poorer effects for removing P and N, poor effluent quality, and being hard to achieve the regulated discharge standard of the existing domestic sewage processing system. A pre-processor, a biological flocculating constituent filter sedimentation tank, a BIOFOR anaerobic biological filter, a BIOFOR aeration biological filter, a back-flushing sewage pool and a clean water pond are arranged in sequence from left to right; the torque flow sand trap of the pre-processor is communicated with the water distribution pipe of the biological flocculating constituent filter sedimentation tank; the outlet channel of the biological flocculating constituent filter sedimentation tank is connected with the water distribution area of the BIOFOR anaerobic biological filter; the outlet channel of the BIOFOR anaerobic biological filter is communicated with the water distribution area of the BIOFOR aeration biological filter; the outlet channel of the BIOFOR aeration biological filter is communicated with one end of an outlet pipe. The P and N removing effects for using the invention to process the domestic sewage are good. Various indexes of the water body after being processed all can achieve the regulated discharge standard.