NOVELTY - A high sealability biogas digester comprises biogas digester (9), feeding pipe (7), fixing cover (3), fixing plate, screw hole, and bolt (2) in which biogas digester upper side is mounted with feeding pipe, feeding pipe and biogas digester are connected with interior, feeding pipe upper part is mounted with fixing cover, fixing cover both sides are mounted with fixing plate, fixing plate is vertically set with screw hole, screw hole is mounted with bolt, biogas digester upper part is mounted with 2 fixing tubes, and fixing tube inner upper part is mounted with fixing ring.    USE - A high sealability biogas digester.    ADVANTAGE - Digester is inexpensive and easy to manufacture and use, prevents entering of oxygen, and has compact structure.    DETAILED DESCRIPTION - A high sealability biogas digester comprises biogas digester, feeding pipe, fixing cover, fixing plate, screw hole, and bolt in which biogas digester upper side is mounted with feeding pipe, feeding pipe and biogas digester are connected with interior, feeding pipe upper part is mounted with fixing cover, fixing cover both sides are mounted with fixing plate, fixing plate is vertically set with screw hole, screw hole is mounted with bolt, biogas digester upper part is mounted with 2 fixing tubes, fixing tube inner upper part is mounted with fixing ring, bolt lower part is entered into fixing tube inner part, bolt lower end is installed with connecting plate, fixing ring and connecting plate are matched, biogas digester upper side is mounted with air outlet pipe (8), biogas digester lower part is set with ramp (10), biogas digester lower side is opened with through hole (11), through hole is located on ramp lower side, biogas digester external side is mounted with discharging pool (12), and discharging pool is located on through hole 1 side of biogas digester.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of high sealability biogas digester.    Bolt (2)    Fixing cover (3)    Feeding pipe (7)    Air outlet pipe (8)    Biogas digester (9)    Ramp (10)    Through hole (11)    Discharging pool (12)