NOVELTY - A two-stage anaerobic membrane bioreactor comprises a main body (19), a distribution pipe, a reaction chamber, a methane collector (5), an inclined plate (7), a membrane assembly (9), a methane transmission pipe (13) and a methane filling pipe (15). Middle of the reaction chamber is divided into a first reaction chamber (4a) and a second reaction chamber (4b). The methane collector is composed of four opposite inclined plates.    USE - A two-stage anaerobic membrane bioreactor.    ADVANTAGE - The reactor has simple structure, stable operation, high volume loading, good processing effect, light membrane pollution, convenient use and small floor space. It can remove chemical oxygen demand (COD), five-day biochemical oxygen demand (BOD5), suspended solids (SS), ammonia-nitrogen (NH3-N) in sewage and recover methane.    DETAILED DESCRIPTION - A two-stage anaerobic membrane bioreactor comprises a main body (19), a distribution pipe, a reaction chamber, a methane collector (5), an inclined plate (7), a membrane assembly (9), a methane transmission pipe (13) and a methane filling pipe (15). The main body is a cylindrical tank structure. Middle of the reaction chamber is divided into a first reaction chamber (4a) and a second reaction chamber (4b) by a separation plate. Bottom part of the first reaction chamber is provided with a first distribution pipe (3a); and its upper part is provided with a first fixing bracket (6a). The first fixing bracket is formed by connecting stainless steel flat steels and welded with steel tank body and embedded with a connection end of reinforced concrete tank body. The first fixing bracket is fixed with methane collector and inclined plate. The methane collector is composed of four opposite inclined plates which are fixed on the first fixing bracket via bolts and stainless steels. Joints of the inclined plates are sealed by plastic films. Upper part of the methane collector is provided with a methane collection pipe. Upper part of the first reaction chamber is a steel, stainless steel or reinforced concrete made annular effluent weir (8) which is fixed on the main body. Lower part of the second reaction chamber is provided with a second distribution pipe (3b). Upper part of the second reaction chamber is provided with a second fixing bracket (6b) fixed with the membrane assembly which is composed of a membrane frame and a membrane element in the frame. The top part of the main body is provided with an annular distribution channel (1) and a water sealing tank (12). The methane filling pipe is mounted with a small hole on the bottom of the membrane assembly. A water outlet valve (17) and a medicine feeding valve (18) are plastic or stainless steel ball valves or sluice valves. The water outlet valve and medicine feeding valve are respectively arranged on a water outlet pipe (10) and a medicine feeding pipe (16).    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating the two-stage anaerobic membrane bioreactor.    Annular distribution channel (1)    Distribution pipes (3a, 3b)    Reaction chambers (4a, 4b)    Methane collector (5)    Fixing brackets (6a, 6b)    Inclined plate (7)    Effluent weir (8)    Membrane assembly (9)    Water outlet pipe (10)    Water sealing tank (12)    Methane transmission pipe (13)    Methane filling pipe (15)    Medicine feeding pipe (16)    Water outlet valve (17)    Medicine feeding valve (18)    Main body (19)