Semi-fixed biological contact oxidation reactor

The invention relates to a semi-fixed biological contact oxidation reactor which comprises an aerobic reaction chamber, the aerobic reaction chamber comprises a first shell and a first packing frame.The first shell includes a containing cavity having an opening in the top, and the first packing frame is arranged in the containing cavity and can rotate in the horizontal direction. The first packing frame is provided with a packing, and the first packing frame is rotated, the part with the packing of the first packing frame moves back and forth between the range above the highest water level line of the containing cavity and below the highest water level line. The first packing frame in the aerobic reaction chamber of the semi-fixed biological contact oxidation reactor is designed to be semi-fixed, stirring can be realized by the rotation of the first packing frame, and part of the packing can be directly exposed out of air, so that the concentration of dissolved oxygen in water is increased, an aeration device