In put hexagon reaction dissolve gas air supporting relates to the solid -liquid separation in sewage treatment field, and including the cell body, the cell body is separated for two regions of left side contact chamber and right side reaction, and left side contact chamber bottom is provided with the backward flow water inlet, the reaction comprises the concatenation of a plurality of regular hexagon cell body, and the regular hexagon cell body that is located the reaction center is the trigeminy reaction, the trigeminy reaction is formed by 3 prism cell body concatenations, is provided with agitating unit in every prism cell body. Simple structure, the cost of manufacture is low, and stability is high, and is difficult damaged, improves and deposit efficiency.