The invention belongs to the technical field of functional material preparation, and relates to a method for preparing a copper phosphotungstate@titanium dioxide core-shell structured nanomaterial .Soluble metal copper salt and phosphotungstic acid are fully mixed in alcohol/water solution, then hydrothermal reaction is conducted, and micro-spheres formed by copper phosphotungstate nanoparticles are obtained through heat treatment .The obtained copper phosphotungstate micro-spheres are stirred in isopropanol solution and subjected to ultrasonic oscillation, and then titanium acetylacetonate is added dropwise slowly; then stirring is conducted, and slow evaporation is conducted, so that a precursor is obtained; the target product is obtained after calcination of the precursor .The process is simple and easy to implement, purity is high, impurity content is low, preparation cost is low, performance is excellent, and bulk industrial production can be achieved .The prepared copper phosphotungstate@titanium dioxide core-shell structured nanomaterial can serve as a visible-light response photocatalyst, and has broad application prospects in the fields of dye wastewater and indoor harmful gas degradation and photocatalysis disinfection.