The invention discloses a water flow mixing aeration tank, which comprises an aeration tank, an inlet pipe, an outlet pipe, a water pump, a filter screen, a pneumatic tube and a stirrer; the inlet pipe is arranged at one side of the bottom of the aeration tank, the outlet pipe is arranged at same side of the inlet pipe, the water pump is arranged at the rear end of the outlet pipe, the filter screen is arranged on the inlet pipe, the pneumatic tube is arranged at the bottom of the aeration tank, and the stirrer is arranged at the center of the aeration tank. Through the above mode, the water flow mixing aeration tank has the advantages of high reliability, good mixing performance, compact structure, high aeration efficiency, stable operation, low energy consumption and low cost, and has wide market prospect in sewage purifying field.