NOVELTY - A device for forming methane via anaerobic tank (22) by taking boiler tail gas as heat source comprises tank; a low temperature flue heat exchanger (4) containing high temperature tail gas outlet, high temperature heat source output interface (5) and medium inlet (13); a heat exchanger (23) arranged on the tank; a conveying pipe (11); and a heat exchange cycle motor (8) arranged on conveying pipe. The high temperature heat source output interface and inlet are communicated via conveying pipe. The device further comprises heat source regulating box (16) and central controller (20).    USE - For producing methane via anaerobic tank by taking boiler tail gas as heat source (claimed).    ADVANTAGE - The device by heating the anaerobic tank via the high temperature tail gas of boiler treats the waste in the wine brewing process, which not only takes full use of waste heat, but also utilizes the waste residue in the wine brewing process, and not only protects the environment, but also obtains mass of methane.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for production of methane via anaerobic tank by taking boiler tail gas as heat source, involving passing the tail gas of the boiler in the wine brewing process via a low temperature flue heat exchanger of the boiler tail gas outlet, heating the medium in the low temperature flue heat exchanger via the tail gas; delivering the heated medium from the conveying pipe to the heat exchanger, thus processing heat by exchanging with the anaerobic tank to make the sewage and waste liquid in the anaerobic tank to a fermentation temperature of high temperature anaerobic bacteria; and refluxing the medium to the low temperature flue heat exchanger and re-heating.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a device.    Low temperature flue heat exchanger (4)    High temperature heat source output interface (5)    Heat exchange cycle motor (8)    Conveying pipe (11)    Medium inlet (13)    Heat source regulating box (16)    Central controller (20)    Anaerobic tank (22)    Heat exchanger (23)