NOVELTY - The membrane bioreactor and microbial fuel cell combined system comprises a head tank (1), a valve (2), a vacuum pressure gauge, a peristaltic pump and a mud valve, where the head tank is interconnected with a water inlet of a membrane bioreactor (3). The membrane bioreactor comprises a membrane component (6), a stainless steel mesh or titanium mesh (7), a sludge pump, a microbial fuel cell and another sludge pump. An inside of the membrane bioreactor is connected with the membrane component and the stainless steel mesh or titanium mesh.    USE - The membrane bioreactor and microbial fuel cell combined system is useful in sewage water treatment.    ADVANTAGE - The system is inexpensive.    DETAILED DESCRIPTION - The membrane bioreactor and microbial fuel cell combined system comprises a head tank (1), a valve (2), a vacuum pressure gauge, a peristaltic pump and a mud valve, where the head tank is interconnected with a water inlet of a membrane bioreactor (3). The membrane bioreactor comprises a membrane component (6), a stainless steel mesh or titanium mesh (7), a sludge pump, a microbial fuel cell and another sludge pump. An inside of the membrane bioreactor is connected with the membrane component and the stainless steel mesh or titanium mesh. The membrane component is constituted using a water collecting pipe, a lead wire, multiple membrane wires and multiple titanium wires. The membrane wires are connected with the water collecting pipe, which is provided with a water outlet and a titanium wire outlet. The membrane component outlet is interconnected with a water outlet pipe that is installed with a peristaltic pump and a vacuum pressure gauge. A lower end of each membrane wire is sealed and an upper end of the membrane wire provided with a water outlet. Each first titanium wire is furnished inside of the membrane wire. An upper end of the membrane wire subsequently threads into the water collecting pipe. The titanium wires are leaded out from a titanium wire outlet, and connected with an end of the lead wire. Another end of the lead wire is connected with an anode of the microbial fuel cell through another titanium wire. A cathode of the microbial fuel cell is connected with stainless steel or titanium meshes through the lead wire and lateral titanium wire. A mud and water mixture outlet of the membrane bioreactor is interconnected with mud water mixture inlets of the microbial fuel cell through the mud valve and the sludge pump. The mud outlets of the microbial fuel cell are interconnected with the mud water mixture inlet of the membrane bioreactor through the lateral sludge pump. The microbial fuel cell comprises the anode, the cathode and a container. A reference electrode jack and a mud inlet are respectively arranged on a top part of the container. A mud outlet is opened at a bottom part of the container. A rotor is internally arranged inside the container and a magnetic stirrer disposed at a lower part of the container. The magnetic stirrer is rationally connected with the rotor using magnetic force. A pneumatic pump, a gas flow meter, a valve and an aerating device are successively interconnected with each other through a pipeline. The aerating device is equipped at a bottom part of the membrane bioreactor. A liquid level controller is installed at the water inlet of the membrane bioreactor to control the liquid level. A baffle is arranged in the membrane bioreactor to separate the water inlet from the main reaction area.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a membrane bioreactor and microbial fuel cell combined system.    Head tank (1)    Valve (2)    Membrane bioreactor (3)    Membrane component (6)    Stainless steel or titanium mesh. (7)