NOVELTY - Movable bed biogas digester comprises a methane tank provided with a fermenting chamber (1), the upper part of the fermenting chamber is provided with a storing chamber (2), on which an air guidance tube (3) is provided, the right side of the fermenting chamber is provided with a slag sinking chamber (9) and both are connected, the top of slag sinking chamber is provided with a water pressing chamber (10), an unloading tube is inserted from the top of the storing chamber to the fermenting chamber and the upper terminal of the unloading tube is provided with a feed inlet.    USE - Used as a movable bed biogas digester.    ADVANTAGE - The digester solves the problem of: uneven distribution of raw materials and non-uniform retention time, presence of dead angle; and inappropriate fermenting time and distribution of the raw materials in the conventional digester.    DETAILED DESCRIPTION - Movable bed biogas digester comprises a methane tank provided with a fermenting chamber (1), the upper part of which is provided with a storing chamber (2), on which an air guidance tube (3) is provided. The right side of the fermenting chamber is provided with a slag sinking chamber (9) and connected to each other. The top of the slag sinking chamber is provided with a water pressing chamber (10). An unloading tube is inserted from the top of the storing chamber to the fermenting chamber. The upper terminal of the unloading tube is provided with a feed inlet. The lower part of the fermenting chamber is horizontally provided with a conveyer composed of two drive wheels and a movable support bottom board, on which the lower part of the unloading tube is located and the lower part of the movable support bottom board is provided with a slag removing machine.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the digester.    Fermenting chamber (1)    Storing chamber (2)    Air guidance tube (3)    Slag sinking chamber (9)    Water pressing chamber (10)