Backflow stirring device

The utility model relates to the technical field of sewage treatment, and discloses a backflow stirring device which comprises a bottom plate, the top of the bottom plate is fixedly connected with an outer cylinder and an inner cylinder, the top of the outer cylinder is fixedly connected with an exhaust pipe, the inner cylinder is arranged on the inner side of the outer cylinder, the interior of the inner cylinder is fixedly connected with a stirring mechanism, and the top of the bottom plate is provided with a backflow mechanism. Through the design of a stirring mechanism, sewage is conveyed into an inner cylinder and then is subjected to anaerobic fermentation, in the process, transmission can be performed after a motor is started, finally, a telescopic rod and a circular plate rotate synchronously, and a brush at the bottom of a strip-shaped plate can scrape on the top of the water surface after the circular plate rotates, so that bubbles possibly existing on the water surface are punctured, and the water