Chemical dosing device for sewage treatment

The utility model discloses a dosing device for sewage treatment, which belongs to the technical field of dosing for sewage treatment and comprises two drainage pipes, a connecting pipe is fixedly connected between the opposite ends of the two drainage pipes, the outer diameter of the connecting pipe is larger than that of the drainage pipes, and two vertical fixing plates are symmetrically arranged on the inner walls of the two drainage pipes respectively. A connecting shaft is rotationally connected between the two fixing plates, one end of the connecting shaft penetrates through and extends out of the fixing plates, two impellers located in the drainage pipe are fixedly connected to the connecting shaft, sewage flowing into the drainage pipe is turned over firstly, then liquid medicine is conveyed through a liquid medicine pipe above the connecting pipe, and the liquid medicine flows into an inner cavity of the connecting pipe; meanwhile, the liquid medicine is mixed with sewage in the connecting pipe, and