NOVELTY - Sewage anaerobic reaction system comprises sewage collecting pool (1), anaerobic reactor (2), methane storage tank (3), where sewage collecting tank and anaerobic reactor is orderly connected with a heat recycling device (4) and heat exchanger (5), where heat recycling device is provided with heat exchange pipe (6), where the anaerobic reactor is connected with the water inlet of heat exchange tube, where anaerobic reaction system further comprises heating device, where heating device and a temperature control device (12) comprising boiler (7).    USE - As sewage anaerobic reaction system (claimed).    ADVANTAGE - The sewage anaerobic reaction system has simple process flow, high marsh gas and saves energy consumption, and the sewage anaerobic reaction system has low construction cost.    DETAILED DESCRIPTION - Sewage anaerobic reaction system comprises sewage collecting pool (1), an anaerobic reactor (2), methane storage tank (3), where sewage collecting tank and anaerobic reactor is orderly connected with a heat recycling device (4) and a heat exchanger (5), the heat recycling device is provided with a heat exchange pipe (6), where the anaerobic reactor is connected with the water inlet of the heat exchange tube, the heat exchange tube is connected with the next water treatment step, the anaerobic reaction system further comprises a heating device, where heating device and a temperature control device (12) comprising a boiler (7), where the boiler is connected with a circulation radiating tube and the second circulation pipe, where the first circulating heat pipe is set in the heat exchanger, and the second cyclic radiating pipe is arranged in the anaerobic reactor, temperature control device for automatically controlling the heating temperature of the heat exchanger and the sewage in the anaerobic reactor. An INDEPENDENT CLAIM is included for anaerobic sewage processing method involving sending the sewage to the heat recycling device, where the sewage enters into the heat exchanger and heat recycler, the sewage heating to the set temperature by the heating device, the sewage after heated by the water inlet of the anaerobic reactor enter into anaerobic reactor, controlling the temperature of the anaerobic sewage in the reactor reaches the set value, the sewage separating and recycling the heat recycling to step a to obtain purified water, purified water and marsh gas, is separated by three in the anaerobic reactor, which is used for pre-heating the sewage in the heat recycling device, and then the purified water discharged to a next processing step.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of sewage anaerobic reaction system.    Sewage collecting pool (1)    Anaerobic reactor (2)    Methane storage tank (3)    Heat recycling device (4)    Heat exchanger (5)    Heat exchange pipe (6)    Boiler (7)    Circulating heat pipe (8)    Circulating water pump (9)    Second circulating heat pipe (10)    Circulating water pump (11)    Temperature control device (12)