NOVELTY - Microbiological fuel cell, comprises anode, cathode, diaphragm, sampling open, anode chamber, cathode chamber, water inlet, water outlet, outer circuit and wire.    USE - The microbiological fuel cell is useful for wastewater treatment (claimed).    ADVANTAGE - The microbiological fuel cell reduces power consumption for wastewater treatment, and is economical.    DETAILED DESCRIPTION - Microbiological fuel cell, comprises anode, cathode, diaphragm, sampling open, anode chamber, cathode chamber, water inlet, water outlet, outer circuit and wire. The anode chamber is connected with cathode chamber through diaphragm, a vacuum pad is clipped between diaphragm and anode chamber and cathode chamber. The anode is installed in the anode chamber, while the cathode is installed in the cathode chamber. The anode and cathode are connected with the outer circuit which is installed at the outside of the microbiological fuel cell through the wire, where side walls of cathode chamber and anode chamber are respectively opened with the water inlet, while the lower portion of the side walls are respectively opened with the water outlet. The cathode chamber is made of organic glass and cathode chamber is filled with algae. An INDEPENDENT CLAIM is included for wastewater treatment method, which involves (i) injecting sewage into anode chamber and cathode chamber, (ii) filling the cathode chamber with algae for providing oxygen, where density of algae is 0.3-1 g/l, (iii) initiating the microbiological fuel cell using microorganism, when the cell voltage is 50 mA, wastewater in the anode chamber is exchanged, till the load voltage is stable at 500 mA, (iv) injecting the wastewater into the anode chamber and injecting the waster water having carbonates into the cathode chamber, where the microorganism disassimilates the organics and obtains the electric power at room temperature, (v) exhausting the wastewater processed by anode chamber totally and injecting fresh wastewater till the potential is lower than 30 mA, and (vi) exhausting the wastewater processed by the cathode chamber totally and injecting wastewater of carbonate, where the density of the carbonate in the carbonate wastewater is 0.02-0.5 g/l.