After entering the regulating pool into the regulating pool, the wastewater enters the bioreactor through the lifting pump and opens the aerator through the PLC controller. The effluent of the bioreactor enters the membrane separation unit through the circulating pump, and the concentrated water returns to the regulating pool. The membrane separation water enters the water tank after the rapid mixing method of chlorination (sodium chlorate, bleaching powder and chlorine). The backwash pump uses the water in the cleaning tank to wash the membrane treatment equipment, and the recoil sewage is returned to the regulating pool. Through the water level control in the bioreactor, the opening and closing of the pump is improved. The filtration operation and backwash operation of membrane unit can be controlled automatically or manually. When the membrane unit needs chemical cleaning operation, the inlet valve and the sewage circulation valve are closed, the washing valve and the reagents circulation valve are opened, the liquid circulation pump is started, and the chemical cleaning operation is carried out.