Aeration biological filter

The utility model discloses an aeration biological filter which comprises a tank body formed by a tank wall (10) and a soleplate (11), wherein a filter plate (9) is arranged in the tank body; a filter head is arranged on the filter plate (9); and filling materials (15) are paved on the filter plate (9). A herringbone gas and water stabilizing chamber (1) is arranged between the filter plate (9) and the soleplate (11); one side of the gas and water stabilizing chamber (1) is provided with a water inlet pipe (4) and a gas inlet pipe (5); the gas inlet pipe (5) is arranged above the water inlet pipe (4); and the other side of the gas and water stabilizing chamber (1) is provided with a manhole (6). The gas and water stabilizing chamber (1) comprises two crown plates (3) which are slantwise arranged, and a side wall (2) connected with the crown plates (3); a water distributing hole (7) is arranged on the side wall (2); and a gas distribution pipe (8) is arranged on the crown plates (3). The utility model has the advantages of uniform and stable water distribution and gas distribution during back flush, and convenient construction, low maintenance workload and construction investment saving.