NOVELTY - A new biogas fermenting device comprises a fermenting tank, a material storehouse, a material mixing tank, a boiler, a feed pump, a material conveying pipe, a slag storage tank, a gas pipe, a gas storage tank, an anti-explosion dehydrating tank (14), a desulfurizing tank (19), a gas pump (17), and a methane purifying device (20); where the periphery of the fermenting tank (35) is provided with insulating layer; the top is provided with feed branches (6), a lightning arrester (7), a safety valve (9), and a gas pipe (8); and the bottom is provided with slag discharge branches (13).    USE - The new biogas fermenting device is useful for large-sized and middle-size continuous fermenting biogas production systems.    ADVANTAGE - The new biogas fermenting device solve the problems that the dead angle locally exists in biogas fermenting tank, the gas yield per volume is low, and the desulfurization and dehydration are not complete.    DETAILED DESCRIPTION - A new biogas fermenting device comprises a fermenting tank, a material storehouse, a material mixing tank, a boiler, a feed pump, a material conveying pipe, a slag storage tank, a gas pipe, a gas storage tank, an anti-explosion dehydrating tank (14), a desulfurizing tank (19), a gas pump (17), and a methane purifying device (20); where the periphery of the fermenting tank (25) is provided with insulating layer; the top is provided with feed branches (6), a lightning arrester (7), a safety valve (9), and a gas pipe (8); the bottom is provided with slag discharge branches (13); the body is inserted with temperature monitoring meters (10) and pH monitoring meters (11); the feed branches of the fermenting tank are connected to a material conveying pipe in parallel and is connected to a material mixing tank through a feed pump; the slag discharge branches at the bottom of the fermenting tank are connected to the slag discharge pipe in parallel and is connected to the slag tank; the branch slag pipes are connected with the material mixing tank; the gas pipe at the top of the fermenting tank is connected to the anti-explosion dehydrating tank; after the gas outlet pipe of the anti-explosion dehydrating tank is connected to the desulfurizing tank and the methane purifying device in order, it is also connected to a gas storage tank through the gas pump; and the gas pipe of the gas storage tank is connected to user pipe network.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the new biogas fermenting device.    Feed branches (6)    Lightning arrester (7)    Gas pipe (8)    Safety valve (9)    Temperature monitoring meters (10)    PH monitoring meters (11)    Slag discharge branches (13)    Anti-explosion dehydrating tank (14)    Gas pump (17)    Desulfurizing tank (19)    Methane purifying device (20)    Fermenting tank (25)