NOVELTY - The internal circulating anaerobic membrane bioreactor comprises a reactor main body (1), a water inlet pipe (4), a water outlet pipe (9), a biogas aerator, a methane pump, a marsh gas pipe (10), a down flow tube, a filler, a baffle plate, a membrane assembly region (12), and a gas-water back washing system. The water outlet pipe is set on a bottom of a reaction area. The reactor main body has reaction zone. The baffle plate is provided with a first reaction zone in the main body, and separates an inside of the reaction zone that is divided into upper and lower areas.    USE - Used as an internal circulating anaerobic membrane bioreactor.    ADVANTAGE - The internal circulating anaerobic membrane bioreactor can be easily and economically manufactured with high efficiency and reduced energy consumption.    DETAILED DESCRIPTION - The internal circulating anaerobic membrane bioreactor comprises a reactor main body (1), a water inlet pipe (4), a water outlet pipe (9), a biogas aerator, a methane pump, a marsh gas pipe (10), a down flow tube, a filler, a baffle plate, a membrane assembly region (12), and a gas-water back washing system. The water outlet pipe is set on a bottom of a reaction area. The reactor main body has reaction zone. The baffle plate is provided with a first reaction zone in the main body, and separates an inside of the reaction zone that is divided into upper and lower areas. The biogas aerator is arranged in the reaction zone. The marsh gas pipe is connected with a top of the biogas aerator. The down flow tube is placed in the reactor main body. The filler is placed in the reaction zone. A middle part of the baffle plate is provided with a second baffle plate. The second baffle plate is arranged on an upper part of the filler, and is divided into an upper area and a storage area. A rising pipe (4) is set in the down stream area. A membrane component is present in the membrane assembly region. The marsh gas pipe passes through a marsh gas and a washing pipe. A diameter of the membrane component is 1-2 mu of non-woven fabrics membrane.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an internal circulating anaerobic membrane bioreactor.    Reactor main body (1)    Water inlet pipe (7)    Rising pipe (4)    Water outlet pipe (9)    Marsh gas pipe (10)    Membrane assembly region. (12)