The invention relates to a method for preparing fluorine and tungste co-doped anatase type nano titanium dioxide composite powder, which is characterized by comprising the following steps: 1) preparing butyl titanate, absolute ethanol, acetic acid, HF, deionized water and ammonium tungstate according to a ratio of 20mL:200mL:5mL:(0.1 to 0.15mL):5mL:(85-340g), mixing and uniformly stirring the absolute ethanol and the acetic acid to obtain mixed liquid and dripping the butyl titanate into the mixed liquid to obtain yellowish sol; 2) preparing solution of fluorine and tungsten; 3) adding F-W-H2O into the yellowish sol to obtain milky sol, and standing the milky sol for 2 to 3 days; and 4) washing the milky sol which is stood for 2 to 3 days with deionized water till the pH value is 7, filtering to obtain a precipitate and drying to obtain the fluorine and tungste co-doped anatase type nano titanium dioxide composite powder. The method has the characteristics of low cost and simple preparation process and can realize batch production, and the prepared fluorine and tungste co-doped anatase type nano titanium dioxide composite powder has the characteristics of high catalytic activity and the like.