The invention discloses a method for preparing a nano-doped intelligent light-adjusting film. The method comprises the steps of preparing nano metal-oxide particle crystal gel by using a hydrothermal-method or solvothermal-method synthesis method, mixing the gel nanoparticles with relatively high dispersion activity with a prepolymer, adding a small amount of coupling agent into the mixture, mixing the nanoparticles and the prepolymer, dispersing the nanoparticles by using stirring and ultrasonic waves so as to form prepolymer nano sol, mixing the prepolymer nano sol with acrylate and nematic liquid crystals, adding a spacer into the mixture, coating the surface of a PET (Polyethyleneglycol Terephthalate) conductive film with the spacer added mixture by a roll coating process, and initiating photopolymerization under the condition of ultraviolet light, thereby preparing the intelligent light-adjusting film with excellent electro-optic characteristics. According to the method, parameters such as dielectric constant and refractive index of a polymeric matrix are changed through carrying out nano modification on the polymeric matrix, the electro-optic properties of the intelligent light-adjusting film are improved, the operating voltage is 30V, and the light transmittance of the intelligent light-adjusting film is about 70%; and meanwhile, the nano metal oxide particles synthesized by using the hydrothermal or solvent method are dispersed in the polymeric matrix, and the nanoparticles are good in dispersion activity and are not prone to agglomeration, so that the homogeneous dispersion of the nanoparticles in the polymeric matrix is guaranteed.