Aerobic double-layer aeration system

The utility model belongs to the technical field of sewage treatment. The utility model relates to an aeration system, in particular to an aerobic double-layer aeration system. Aerobic tank, a lower-layer aeration system and an upper-layer aeration system are distributed in the aerobic tank from bottom to top; the lower-layer aeration system comprises a lower-layer air inlet main pipe, a lower-layer air inlet branch pipe, a lower-layer air inlet branch pipe and a lower-layer air outlet branch pipe, the lower-layer air inlet main pipe is located above one end of the aerobic tank, and the outputend of the lower-layer air inlet main pipe is fixedly connected with the lower-layer air inlet branch pipe attached to the inner side wall of the aerobic tank; according to the system, sewage is subjected to aerobic reaction in a double-layer aeration manner; under the condition of the same tank volume, dissolved oxygen can be increased, the biochemical aerobic treatment effect is greatly improved, compared with a tradit