The WO3/TiO2 composite thin films have many special properties and become an excellent photoelectric functional material. Adopting advanced thin film deposition technology to obtain nanostructured WO3/TiO2 composite thin films with excellent properties is of great significance for improving the performance and application of photovoltaic devices. The sol-gel method, hydrothermal method, electrodeposition method and magnetron sputtering method were mainly introduced to prepare nanostructured WO3/TiO2composite thin films. The applications of nanostructured WO3/TiO2 composite thin films in electrochromic smart window, photocatalysis technology and humidity sensor were summarized. Finally, the future development tendency of nanostructured WO3/TiO2 composite thin films was proposed.