NOVELTY - A five stage anaerobic methane reactor comprises cover plate II (2), material inlet pond (4), first stage anaerobic pond (7), second stage anaerobic pond (9), material outlet pond (11), third stage anaerobic pond, overflowing pipe, overflowing opening, gas collecting cover, water sealing pond, methane pressurizing pipe, methane spraying pipe, liquid inlet, fourth stage anaerobic pond, five stage anaerobic pond and aerobic pond. The methane pressurizing pipe and methane spraying pipe sprays methane in anaerobic pond into next stage anaerobic pond to further purify.    USE - Five stage anaerobic methane reactor.    ADVANTAGE - The reactor generates methane while further processing domestic garbage, straw and night soil; and generates environmentally friendly product.    DETAILED DESCRIPTION - Five stage anaerobic methane reactor comprises cover plate II (2), material inlet pond (4), first stage anaerobic pond (7), second stage anaerobic pond (9), material outlet pond (11), third stage anaerobic pond, overflowing pipe, overflowing opening, gas collecting cover, water sealing pond, methane pressurizing pipe, methane spraying pipe, liquid inlet, fourth stage anaerobic pond, five stage anaerobic pond and aerobic pond. The methane pressurizing pipe and methane spraying pipe sprays methane in anaerobic pond into next stage anaerobic pond to further purify. The top parts of fourth stage anaerobic pond and five stage anaerobic pond are provided with water sealing pond and gas collecting cover, where overflowing tube is installed between fourth stage anaerobic pond and overflowing opening. The second stage anaerobic pond is installed in upper part of inner first stage anaerobic pond. The aerobic pond is installed between second stage anaerobic pond and third stage anaerobic pond. The heat in aerobic pond is used for heating upper and lower ponds. The liquid inlet is installed in extreme high part so that liquid can automatically flow into third stage anaerobic pond, fourth stage anaerobic pond, five stage anaerobic pond, aerobic pond and material inlet pond. The methane spraying tube sprays methane generated by prior stage into next stage anaerobic pond to further purify and obtain methane with high content. The gas collecting cover is directly covered into water sealing pond and has good sealability.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating a five stage anaerobic methane reactor.    Cover plate ii (2)    Material inlet pond (4)    Anaerobic pond (7)    Second stage anaerobic pond (9)    Material outlet pond (11)