NOVELTY - An automatic temperature control methane experimental apparatus comprises a fermenting device, a heating and heat insulating device, and a metering device; where the fermenting device comprises a tank body and a gas exhaust valve (13); the heating and heat insulating device comprises a heater (6) and a heat insulating material (7); the heater (6) is arranged on the side wall of the tank body; the heat insulating material (7) is arranged around the tank body and the heater (6); and the side wall of the tank body consists of a tank body inner wall (3) and a tank body outer wall (5).    USE - The automatic temperature control methane experimental apparatus is useful for dry fermentation with crop straws and animal excrement as raw material in a lab.    ADVANTAGE - The automatic temperature control methane experimental apparatus can keep the experimental temperature at a set value to increase the accuracy and safety of the experiment.    DETAILED DESCRIPTION - An automatic temperature control methane experimental apparatus comprises a fermenting device, a heating and heat insulating device, and a metering device; where the fermenting device comprises a tank body and a gas exhaust valve (13); the gas exhaust valve (13) is arranged on the top of the tank body; the heating and heat insulating device comprises a heater (6) and a heat insulating material (7); the heater (6) is arranged on the side wall of the tank body; the heat insulating material (7) is arranged around the tank body and the heater (6); the side wall of the tank body is a two-layer structure consisting of a tank body inner wall (3) and a tank body outer wall (5); the heating and heat insulating device is also equipped with a temperature control instrument (2), a temperature sensor (8), and a water (4); the temperature sensor (8) and the water (4) are arranged between the tank body inner wall (3) and the tank body outer wall (5); the temperature sensor (8) transmits water temperature information to the temperature control instrument (2); and the temperature control instrument (2) adjusts the temperature of the water (4) by controlling the heater (6).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the automatic temperature control methane experimental apparatus.    Liquid discharging valve (1)    Temperature control instrument (2)    Tank body inner wall (3)    Water (4)    Tank body outer wall (5)    Heater (6)    Heat insulating material (7)    Temperature sensor (8)    Sealing rubber gasket (9)    Cover plate (10)    Bolt (11)    Liquid feeding valve (12)    Gas exhaust valve (13)    Methane pressure gauge (14)    Gas exhaust pipe (15)    Flowmeter (19)