NOVELTY - An environment-friendly efficient methane generator comprises a ball shape tank (8) having an upper side that is set with a feed opening (14), and a gas heating device; where the feed opening (14) is furnished at the side upper part of the tank (8); the feed opening (14) is mounted with feed opening cover (17); the lower part of the tank (8) is mounted with support (1); and the gas heating device comprises a gas stove (25), a shell (24), a gas supply pipe (23), a hot water inlet pipe (21), a hot water return pipe (26), a heating pipe coil (27), and a heated pipe coil (22).    USE - The environment-friendly efficient methane generator is useful for industrial and commercial applications.    ADVANTAGE - The environment-friendly efficient methane generator uses the methane generated by itself to heat; where the side face of the tank can set a diaphragm pump for washing and extracting the methane liquid. Moreover, compared with the existing technology, the use of the high temperature fermentation of the generator can improve the gas yield. Additionally, it is simple structured, convenient to wash, safe and reliable, movable, environment-friendly, and highly efficient.    DETAILED DESCRIPTION - An environment-friendly efficient methane generator comprises a ball shape tank (8) having an upper side that is set with a feed opening (14), and a gas heating device; where the feed opening (14) is furnished at the side upper part of the tank (8); the feed opening (14) is mounted with feed opening cover (17); the lower part of the tank (8) is mounted with support (1); the top of the tank (8) is set with air outlet pipe (12); the air outlet pipe (12) is set with moisture separator (11); the bottom of the tank (8) is set with a dump opening (28), which is set with a valve; the gas heating device comprises a gas stove (25), a shell (24), a gas supply pipe (23), a hot water inlet pipe (21), a hot water return pipe (26), a heating pipe coil (27), and a heated pipe coil (22); the air outlet pipe (12) is connected to the gas stove (25) through the gas supply pipe (23); the hot water inlet pipe (21), the hot water return pipe (26), the heating pipe coil (27), and the heated pipe coil (22) form a close thermal medium circulatory system; the heating pipe coil (27) is furnished at the lower part of the gas stove (25) in the shell (24); the heated pipe coil (22) is set at the inside bottom of the tank (8); and the thermal medium circulatory system is set with the swell water box (20).    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the environment-friendly efficient methane generator.    Support (1)    Ball shape tank (8)    Moisture separator (11)    Air outlet pipe (12)    Feed opening (14)    Feed opening cover (17)    Swell water box (20)    Hot water inlet pipe (21)    Heated pipe coil (22)    Gas supply pipe (23)    Shell (24)    Gas stove (25)    Hot water return pipe (26)    Heating pipe coil (27)    Dump opening (28)