The utility model discloses a titanium dioxide waste water settling device. The titanium dioxide waste water settling device comprises a tank body and a control valve, wherein the tank body is internally provided with a settling chamber, and an inlet and an outlet which communicate the settling chamber with the outside are formed in the tank body; the control valve is arranged at the outlet so as to open and close to the outlet. The titanium dioxide waste water settling device disclosed by the embodiment of the utility model can recycle titanium dioxide in washing water, thus having the advantages of reducing the waste of titanium dioxide, improving the utilization rate of the titanium dioxide base stock, increasing the economic benefits, and the like.