NOVELTY - A biogas generating pit heated with methane boiler, comprises a methane boiler (1), a thermal storage water tank (2), a biogas generating pit (3), a radiating pipe (4), a controller (5), temperature sensors (6,7), a pipe pump (8), and electromagnetic valves (9,10,11,12).    USE - The biogas generating pit heated with methane boiler is useful for industrial applications.    ADVANTAGE - The biogas generating pit ensures the normal use of the biogas generating pit in winter in the frigid area of China by heating the dosage liquor in the biogas generating pit with methane boiler. Moreover, it has simple structure, high efficiency, convenient use, and reliable operation.    DETAILED DESCRIPTION - A biogas generating pit heated with methane boiler, comprises a methane boiler (1), a thermal storage water tank (2), a biogas generating pit (3), a radiating pipe (4), a controller (5), temperature sensors (6,7), a pipe pump (8), and electromagnetic valves (9,10,11,12); where the water outlet of the methane boiler has a connection with the thermal storage water tank through the circulating pipe and the electromagnetic valve (10); the bottom of the thermal storage water tank is connected to the water inlet end of the radiating pipe in the biogas generating pit through the circulating pipe and the electromagnetic valve (9); the backwater end of the radiating pipe is connected to the methane boiler through the circulating pipe, the pipe pump, and the electromagnetic valve (11); the heated working substance in the methane boiler heats the dosage liquor in the biogas generating pit through the radiating pipe; the backwater pipe returns the dosage liquor to the methane boiler to construct the circulating system; the temperature sensors are disposed in the thermal storage water tank and the biogas generating pit; the temperature sensors are connected to the signal input end of the controller; and the signal output end of the controller is connected to the water circulating pump and the electromagnetic valves.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the biogas generating pit heated with methane boiler.    Methane boiler (1)    Thermal storage water tank (2)    Biogas generating pit (3)    Radiating pipe (4)    Controller (5)    Temperature sensors (6,7)    Pipe pump (8)    Electromagnetic valves (9,10,11,12)