NOVELTY - The method comprises preparing an anode by sandwiching two pieces of carbon felt having a thickness of 1 cm and fixing carbon fiber thread wire on the anode, preparing a cathode by adding 0.8 g/l of potassium nitrate, 15 g/l of monopotassium phosphate, 0.8 g/l of magnesium sulfate heptahydrate, and 2.5 g/l of sodium succinate, culturing Pseudomonas by adding an active sludge to a culture, and pretreating Pseudomonas culture medium in an ultrasonic cell crusher by applying ultrasonic waves at a power of 200-600W for 10-20 minutes.    USE - The method is useful for manufacturing a microbial fuel cell device that is useful for producing electricity and treating wastewater (claimed).    ADVANTAGE - The method is capable of manufacturing the fuel cell device with high reliability and performance, compact size and increased capacity and treatment efficiency.    DETAILED DESCRIPTION - The method comprises preparing an anode by sandwiching two pieces of carbon felt having a thickness of 1 cm and fixing carbon fiber thread wire on the anode, preparing a cathode by adding 0.8 g/l of potassium nitrate, 15 g/l of monopotassium phosphate, 0.8 g/l of magnesium sulfate heptahydrate, and 2.5 g/l of sodium succinate, culturing Pseudomonas by adding an active sludge including 0.54 g/lm of sodium acetate, 4.2 mg/l of anhydrous ferrous chloride, 0.06 g/l of potassium dihydrogen phosphate, 2.412 g/l of dipotassium hydrogen phosphate, 0.48 g/l of calcium chloride, 0.3 g/l of ammonium chloride, 0.08 g/l of magnesium sulfate heptahydrate and 0.6 mg/l of manganese (II) sulfate to a culture with pH of 6.5-7.5 in a beaker, pretreating the Pseudomonas culture medium in an ultrasonic cell crusher by applying ultrasonic waves at a power of 200-600W for 10-20 minutes, treating the anode by adding 0.6-0.8% of N,N,N',N'-tetramethylethylenediamine and 0.8 g of activated carbon dissolved in polyethylene glycol, treating the cathode by adding 0.8-1.2 g of sodium alginate dissolved in polyvinyl alcohol and the desalinating the cathode and then desalinating the water, preparing anolyte with a pH of 6.5-7.5 by adding 0.54 g/lm of sodium acetate, 4.2 mg/l of anhydrous ferrous chloride, 0.06 g/l of potassium dihydrogen phosphate, 2.412 g/l of dipotassium hydrogen phosphate, 0.48 g/l of calcium chloride, 0.3 g/l of ammonium chloride, 0.08 g/l of magnesium sulfate heptahydrate and 0.6 mg/l of manganese (II) sulfate, preparing a catholyte having a pH of 7.5 by adding 0.8 g/l of potassium nitrate, 15 g/l of monopotassium phosphate, 0.8 g/l of magnesium sulfate heptahydrate, and 2.5 g/l of sodium succinate, and providing a return type plexiglass frame, cathode chambers, anode chambers, a salt bridge, a cathode liquid inlet tube, cathode fluid outflow tube, an anode chamber inlet tube, an anode chamber outlet tube, peristaltic pumps, valves, tube cathode chamber inlet tube, a cathode terminal, an anode terminal, the anode, the cathode, and a separator. The cathode chamber and the anode chamber are separated by the salt bridge. The cathode chamber has a volume of 200-500 ml. The chambers are provided in the frame, and are connected to each other through the pipes. The anolyte is provided in the anode chamber. The catholyte is provided in the cathode chamber.