The invention relates to an intelligent temperature-control vanadium dioxide nano composite multifunctional thin film and a preparation method thereof, and is characterized in that the nano composite thin film is VO2/SiO2, VO2/ZnO, VO2/ZrO2 or VO2/TiO2. The composite thin film consists of nano particles, wherein the size of the nano particles is kept between 10 and 500 nanometers, and the thickness of the composite thin film is 50 to 3,000 nanometers. In the invention, a wet chemical solution process is adopted, vanadium pentoxide (V2O5) powder serving as a precursor is uniformly dispersed and dissolved in a weakly reducing organic solvent to form a VOx thin film (x is more than 2.0 and less than 2.5), and the vanadium dioxide (VO2) thin film is formed by post treatment; and the nano composite thin film is prepared by a sol-gel technique. The VO2 nano composite thin film system based on co-doping and interface synergetic effect has high visible light transmittance, high infrared thermosensitive property, hydrophilic and photocatalytic functions and other functions, and a bright prospect.