NOVELTY - A full-automatic deslagging biogas tank without maintenance by entering the biogas tank comprises a tank body (1), a feed pipe (2), a water pressure room (6), and a deslagging tank (4); where the feed pipe, the water pressure room, and the deslagging tank are connected with the tank body respectively; the top surface (12) of the tank body is only provided with a gas outlet hole (3); the bottom surface (11) of the tank body is inclined; and the bottom surface of the tank body is provided with at least two guide ditches (112) extended from the high end to the low end.    USE - The full-automatic deslagging biogas tank is useful for industrial and commercial applications.    ADVANTAGE - The full-automatic deslagging biogas tank has large fermentation area, does not remain the dead corners and skin, can deslag fully automatically, is free from maintenance by entering the biogas tank, does not accumulate slag in the water pressure room, and has abundant raw material resources. Moreover, the wastewater does not flow backwards to enter the tank body and the gas outlet hole.    DETAILED DESCRIPTION - A full-automatic deslagging biogas tank without maintenance by entering the biogas tank comprises a tank body (1), a feed pipe (2), a water pressure room (6), and a deslagging tank (4); where the feed pipe, the water pressure room, and the deslagging tank are connected with the tank body respectively; the top surface (12) of the tank body is only provided with a gas outlet hole (3); the bottom surface (11) of the tank body is inclined; the bottom surface of the tank body is provided with at least two guide ditches (112) extended from the high end to the low end; the lowest position of the bottom surface of the tank body is provided with a groove (111) for charging; the feed pipe is mounted on the tank body at one side of the high end of the tank bottom; and the deslagging tank is mounted on the tank body at one side of the low end of the tank bottom by the deslagging pipe (5).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the full-automatic deslagging biogas tank without maintenance by entering the biogas tank.    Tank body (1)    Feed pipe (2)    Gas outlet hole (3)    Deslagging tank (4)    Deslagging pipe (5)    Water pressure room (6)    Bottom surface (11)    Top surface (12)    Groove (111)    Guide ditches (112)