Low-phosphorus wastewater treatment system

The utility model discloses a low-phosphorus wastewater treatment system and belongs to the technical field of water treatment. Comprising a regulation and storage tank, a high-density sedimentation tank, a middle water tank, a PCF filter, an ultrafiltration filter, an ultrafiltration water production tank, a nanofiltration filter, a nanofiltration water production tank, a reverse osmosis filter, a sludge tank, a filter press and a concentrated water tank, the regulation and storage tank, the high-density sedimentation tank, the intermediate water tank, the PCF filter, the ultrafiltration filter, the ultrafiltration water production tank, the nanofiltration filter, the nanofiltration water production tank and the reverse osmosis filter are sequentially connected, and a backwashing water inlet of the PCF filter and a backwashing water inlet of the ultrafiltration filter are both connected with the ultrafiltration water production tank; a sludge outlet of the high-density sedimentation tank, the sludge tank and