NOVELTY - A residue scrapping-type discharging device of straw methane tank, installed in a methane fermentation jar (1), comprises a material outlet (3) that is installed under the liquid level (2) on the inner wall of the methane fermentation jar (1); where a baffle (4) is installed above the material outlet (3) on the inner wall of methane fermentation jar (1); the lower boarder of the baffle (4) is stretched to the downside of material outlet (3); and a sliding frame (6) is installed in the methane fermentation jar (1) at the lower boarder of the baffle (4) corresponding to the material outlet (3).    USE - The residue scrapping-type discharging device of straw methane tank is useful for industrial applications.    ADVANTAGE - The residue scrapping-type discharging device of straw methane tank can discharge methane under condition of continuous generation of methane, which solves the problem of up flotation and blocked reside discharge of straw fermentation raw material residues. Moreover, it has simple structure, convenient use, and low production cost.    DETAILED DESCRIPTION - A residue scrapping-type discharging device of straw methane tank, installed in a methane fermentation jar (1), comprises a material outlet (3) that is installed under the liquid level (2) on the inner wall of the methane fermentation jar (1); where a baffle (4) is installed above the material outlet (3) on the inner wall of the methane fermentation jar (1); the lower boarder of the baffle (4) is stretched to the downside of the material outlet (3); a sliding frame (6) is installed in the methane fermentation jar (1) at the lower boarder of the baffle (4) corresponding to the material outlet (3); the sliding frame (6) is installed on a sliding track (5); the sliding frame (6) is uniformly set with a narrow bar (61); the narrow bar (61) is uniformly set with narrow teeth (62); a straight repeatedly moving mechanism (7) is fixed on the inner wall of the methane fermentation jar (1) opposite to the material outlet corresponding to the sliding frame (6); and the flexible end of the straight repeatedly moving mechanism (7) is connected with one end of the sliding frame (6).    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the residue scrapping-type discharging device of straw methane tank.    Methane fermentation jar (1)    Material outlet (3)    Baffle (4)    Sliding frame (6)    Straight repeatedly moving mechanism (7)