NOVELTY - A high ammonia-nitrogen biogas liquid cultivation biological purification device comprises biological filter tower and secondary purification filter in which biological filter tower is surrounded by wall (7) of multi-layer building structure and consists of tower top (1), tower marsh liquid inlet pipe (2), shower nozzle (3), network-like structure bracket (4), biological filter tower absorbing solid (5), biological filtering tower immobilized bacteria porous body (6), drain groove (8), outlet water pipe (10), and inclined-shaped separating water pool (11), and each wall maintains window.    USE - A high ammonia-nitrogen biogas liquid cultivation biological purification device.    ADVANTAGE - Product is low-cost.    DETAILED DESCRIPTION - A high ammonia-nitrogen biogas liquid cultivation biological purification device comprises biological filter tower and secondary purification filter in which biological filter tower is surrounded by wall of multi-layer building structure and consists of tower top, tower marsh liquid inlet pipe, shower nozzle, network-like structure bracket, biological filter tower absorbing solid, biological filtering tower immobilized bacteria porous body, drain groove, outlet water pipe, and inclined-shaped separating water pool, biological filter tower is inside body of multi-layer structure, each wall maintains window, each bottom is mounted on network-like structure bracket, gap is provided between layers, top is mounted on tower marsh liquid inlet pipe and shower nozzle, each layer of lower part is filled with biological film of biological filter tower absorbing solid, upper part is filled with biological filtering tower immobilized bacteria porous body, biological filtering tower immobilized bacteria porous body and biological filter tower absorbing solid by network-like structure bracket are fixed on biological filtering tower, bottom layer of biological filter tower is provided with inclined-shaped separating water pool, inclined-shaped separating water pool is provided with end drainage groove, inclined-shaped separating water pool is set on shallow end of water valve (9) and outlet water pipe, biological filtering tower through outlet water pipe and purified water liquid storage tank with secondary water purification filter is connected, secondary water purification filter and filtration pool consists of purified water liquid storage tank, secondary purification filtering solid adsorption, secondary purification filtering immobilized bacteria porous body, track plate, wall body, high density biological film filter screen, and water outlet, purified water liquid storage tank is behind section of multiple track plate consisting of white and dislocated runway, track plate on suction is provided with secondary purification filtering solid adsorption, track from secondary purification filtering solid adsorption is provided with wall body, and wall body is foldable behind high density biological film filter screen and followed by water outlet of secondary purification filter.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of biological filter tower in high ammonia-nitrogen biogas liquid cultivation biological purification device.    Tower top (1)    Tower marsh liquid inlet pipe (2)    Shower nozzle (3)    Network-like structure bracket (4)    Biological filter tower absorbing solid (5)    Biological filtering tower immobilized bacteria porous body (6)    Wall (7)    Drain groove (8)    Water valve (9)    Outlet water pipe (10)    Inclined-shaped separating water pool (11)