The utility model discloses a microbial aqueous solution stirring tank. Including a large tank, the large tank is divided into a left small tank and a right small tank; a stirrer is arranged on the tank surface of each small tank; a water inlet pipe is arranged on the upper portion of the large tank and provided with two water outlets with valves, the two water outlets are located in the left small tank and the right small tank respectively, a liquid outlet pipe is arranged on the lower portion of the large tank, two liquid inlets of the liquid outlet pipe are located in the left small tank and the right small tank respectively, and the liquid outlet pipe is also provided with a valve used for controlling each liquid inlet. Wherein a dissolving tank is arranged outside the large tank, thedissolving tank comprises a cylindrical tank body, a feeding hole and a stirrer are arranged at the top of the tank body, a spraying water pipe is arranged around the circumference of the tank body, the bottom end of the tank body is connected with a conical funnel, the bottom end of the funnel is connected with a liquid outlet hose, and the liquid outlet hose is connected to a water inlet pipe. The stirring tank overcomes the defects that the existing petroleum hydrocarbon microbial degradation aqueous solution stirring tank cannot realize the mutual switching and continuous stirring output of the left tank body and the right tank body, and the stirring tank cannot fully dissolve powder raw materials.