Circulating water tank

The utility model discloses a circulating water tank. Relating to the technical field of waste gas treatment, the device comprises a storage container, a collecting tank, a spraying device and a controller, a partition part is arranged in the middle of the storage container so that the storage container can be divided into a first storage part and a second storage part. The collecting tank is arranged above the first storage part; the collecting tank is connected with the first storage part in a sliding manner; the spraying device is arranged above the second storage part; a first foam sensoris arranged on the inner wall of the first storage part; a second foam sensor is arranged on the inner wall of the second storage part; aiming at the technical problem that a large amount of foam is generated in the circulating water tank during waste gas treatment in the prior art, the foam in the first storage part can be maintained in a normal range, and secondary pollution caused by excessiveoverflow of the foam is av