Aeration structure of sewage treatment tank

The utility model relates to an aeration structure of a sewage treatment tank. An inverted-frustum-shaped flow guide column is arranged in the shell. A plurality of inclined main channels are arrangedin the flow guide column from bottom to top; an opening in the lower end of each main channel is aligned with an opening in the upper end of a bent outlet, located in the shell, of the flange; a water suction port enabling the main channels to be communicated with the interior of the shell is formed in the outer edge of the flow guide column, an opening in the upper end of each main channel is aligned with an outlet formed in the surface of the upper cover, and the inner diameter of each main channel is gradually increased and then decreased from the lower end to the upper end. According to the utility model, the change of the inner diameter of the main channel, the arrangement of the auxiliary channel, the alignment arrangement of the flow guide column and the water inlet and the alignment arrangement of the flo