NOVELTY - A temperature control system of biogas fermentation, comprises a gas taking pipe (2) derived from a fermentation tank (1), a combustion control room (3) connected to the gas taking pipe (2), a heat-dissipation stack (4) connected to the combustion control room (3), and a combustion control system (5) for controlling the combustion of the biogas in the combustion control room (3).    USE - The temperature control system is useful for biogas fermentation (claimed).    ADVANTAGE - The temperature control system has simple structure, novel and reasonable design, high work reliability; it increases the gas generation rate by improving the temperature in the fermentation tank; the system is of low cost and good application effect, thus it is suitable for promotion and application.    DETAILED DESCRIPTION - A temperature control system of biogas fermentation, comprises a gas taking pipe (2) derived from a fermentation tank (1), a combustion control room (3) connected to the gas taking pipe (2), and a heat-dissipation stack (4) connected to the combustion control room (3); the heat-dissipation stack (4) passes through the side wall of the fermentation tank (1), penetrates into the fermentation tank (1), and extends from the bottom of the fermentation tank (1) to the outside, a combustion control system (5) for controlling the combustion of the biogas in the combustion control room (3) is set on the combustion control room (3); the combustion control system (5) comprises a controller (5-1) and a power circuit (5-2) for supplying the power to the system, the input end of the controller (5-1) is connected to a pressure sensor (5-3) for detecting the pressure in the fermentation tank (1), a temperature sensor (5-4) for detecting the temperature in the fermentation tank, and a keyboard circuit (5-5) for setting the system parameters, the controller (5-1) receives the pressure signal detected by the pressure sensor (5-3), the temperature signal detected by the temperature sensor (5-4), and the system diameters signals inputted by the keyboard circuit (5-5) as well as outputs the corresponding control signals to an electromagnetic gas valve (5-6), a display circuit (5-7), and a high voltage ignition circuit (5-8) after analysis and treating, the pressure sensor (5-3) and the temperature sensor (5-4) are both set on the inner wall of the fermentation tank (1), the electromagnetic gas valve (5-6) is connected in the gas taking pipe (2) and controls the starting and closing of the gas taking pipe (2), the high voltage ignition circuit (5-8) comprises a triode (5-81) connected to the controller (5-1) and a high voltage transformer (5-82) connected to the triode (5-81) as well as generates the high voltage and fires the biogas.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a temperature control system of biogas fermentation.    Fermentation tank (1)    Gas taking pipe (2)    Combustion control room (3)    Heat-dissipation stack (4)    Combustion control system (5)