The invention belongs to the field of environmental protection, and in particular relates to a synthetic method of a double-component composite oxide containing TiO2 and WO3. The synthetic method comprises steps of: taking an appropriate amount of metatitanic acid solid, and utilizing an intensive mixer half-dry mixing method to break the metatitanic acid solid into small particles; at the same time, dissolving ammonium paratungstate in an ethanol amine or hydrogen peroxide-nitric acid solution under the heating condition; then directly adding the ammonium paratungstate solution and a surfactant into the small metatitanic acid particles, and utilizing ammonia water to regulate the pH value of a material; and adopting an intensive mixer to mix and drain the material for a while, then directly calcining the material in a rotary kiln for 3-8 hours, milling a calcined product through utilizing a ball mill or a superfine mill, and thus synthesizing a TiO2-WO3 composite oxide powder. The crystal form of the obtained TiO2-WO3 composite oxide is in an anatase structure, the TiO2-WO3 composite oxide particles are uniform, and the specific surface area of the TiO2-WO3 composite oxide is suitable (80-150m<2>/g). According to the method, a half-dry mixed head product can be directly calcinated; the method has the characteristics of controllable product ingredients, excellent performance, simple operation process and the like, and can be easily used for large-scale industrial production; and moreover, a pollutant-ammonia is exhausted in a gas phase and easily controlled.