NOVELTY - An anaerobic reactor includes a reactor shell (1), a waste gas pipe (13), and a methane pipe (14) mounted on a top of reactor shell. A material baffle (5) and a hydraulic pressure sealing door (4) are arranged on an end of the reactor shell from inward to outward in series. A geothermal pipe (10) and a heat preventing pipe (12) are arranged on a bottom side of the reactor shell and a vertical side shell except the hydraulic pressure sealing door. An overflow groove (6) is arranged on a bottom of an outer side of the material baffle.    USE - Anaerobic reactor used for methane production.    DETAILED DESCRIPTION - An anaerobic reactor comprises a reactor shell (1), a waste gas pipe (13), and a methane pipe (14) mounted on a top of reactor shell. A material baffle (5) and a hydraulic pressure sealing door (4) are arranged on an end of the reactor shell from inward to outward in series. A geothermal pipe (10) and a heat preventing pipe (12) are arranged on a bottom side of the reactor shell and a vertical side shell except the hydraulic pressure sealing door. An overflow groove (6) is arranged on a bottom of an outer side of the material baffle. A maintaining groove (8) is arranged on a bottom of an outer side of the hydraulic pressure sealing door. An upper end of an overflow pipe (7) is connected with the overflow groove while a lower end is stretched into the maintaining groove. An air supply pipe (11) is arranged under the bottom shell of the reactor shell. Branch pipes distributed on the air supply pipe are connected to the interior of reactor by penetrating the bottom shell of the reactor shell. A spraying pipe (2) is arranged out of a top of the reactor shell; and spraying heads (3) distributed on the spraying pipe are mounted on the top of the reactor shell by penetrating.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of anaerobic reactor.    Reactor shell (1)    Spraying pipe (2)    Praying head (3)    Hydraulic pressure sealing door (4)    Material baffle (5)    Overflow groove (6)    Overflow pipe (7)    Maintaining groove (8)    Geothermal pipe (10)    Air supply pipe (11)    Heat preventing pipe (12)    Waste gas pipe (13)    Methane pipe (14)