The invention pertains to the field of liquid crystal materials and particularly provides an intelligent shielding thin-film material and a preparation method thereof, applicable to the preparation of a new flexible thin-film material of which the transmissivity gradually reduces and increases with the rise and reduction of temperature. A vertical polymer network is used by the invention for fixing smectic phase liquid crystal molecules changing from smectic phase to chiral nematic phase and a chirality compound with chiral turning and a chirality compound opposite to low-temperature turning direction are used as chiral additives so as to realize the gradual change from a transparent state to a scattering state. Through the adjustment of the proportion of the two chirality compounds, the change speed of the two states can be adjusted. The material and the method of the invention have the advantages that the automatic adjustment of the transmissivity with the change of the ambient temperature can be realized and the material of the invention can be used as a sticking film of glasses of doors and windows in buildings for intelligently adjusting the transmission and interception of light beams, thereby being capable of saving energy resources and reducing discharge of harmful gases from indoor air conditionings, such as carbon dioxide, and the like, and being beneficial to energyconservation and environmental protection.