The invention discloses a nitrogen and phosphorus removal electricity generator, and belongs to the technical field of sewage treatment. A traditional A2/O technology and a microbial fuel cell are coupled. The nitrogen and phosphorus removal electricity generator comprises a water tank, an anaerobic pond, an oxygen shortage pond, an aerobiotic pond and a settling pond, wherein the water tank, the anaerobic pond, the oxygen shortage pond, the aerobiotic pond and the settling pond are sequentially connected. The anaerobic pond and the aerobiotic pond are separated through a proton exchange membrane, the anaerobic pond serves as an anode chamber of a microbial fuel cell, the aerobiotic pond serves as a cathode chamber of the microbial fuel cell, the anode chamber and the cathode chamber are respectively and externally connected with a resistance box through a carbon felt electrode and a copper wire respectively, and a closed loop is formed; the oxygen shortage pond is connected with the aerobiotic pond through a mixed liquid refluxing pipe, the anaerobic pond is connected with the settling pond through a refluxing sludge pipe, and the settling pond is further provided with a water outlet and a sludge discharging opening. Electric energy is generated while sewage treatment, and the A2/O technology and the microbial fuel cell technology are coupled. According to the method, domestic sewage is treated through the A2/O technology, the concentration of COD in sewage, the concentration of TP in the sewage and the concentration of TN in the sewage are reduced, a stable voltage value is generated while water body purifying, pollutants in the sewage are effectively reduced, and electric energy is generated.