Sewage treatment plant aeration tank based on aeration fan

A sewage treatment plant aeration tank based on an aeration fan comprises a tank body, a column pipe is integrally formed in the middle of the interior of the tank body, an aeration annular groove is formed between the inner side wall of the tank body and the outer wall of the column pipe, a lower through-flow pipe and an upper through-flow pipe are arranged on the outer side of the tank body, and an aeration conveying piece is arranged below the outer side of the tank body; an inner ring pipe communicated with the aeration conveying part is arranged at the bottom end in the aeration ring groove, a plurality of pairs of aeration parts are arranged at the top of the inner ring pipe in the circumferential direction at equal intervals, each aeration part comprises two symmetrically-arranged gas spraying pipes, and the middle positions of the bottoms of the gas spraying pipes are rotationally communicated and connected with the inner ring pipe through communicating parts; a plurality of aeration heads are uniform