NOVELTY - A copper sulfide aluminum isolated film comprises: nanometer powder containing copper aluminum sulfide, where the isolated film has strong near infrared ray absorption property.    USE - As copper sulfide aluminum isolated film as absorbing material for absorbing near infrared light (claimed) and for solar heat shielding.    ADVANTAGE - The copper sulfide aluminum isolated film can be prepared using simple process, which is economical, convenient to operate.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) isolated thin film substrate prepared by using organic modified silicon alkoxide methyl triethoxysilane (MTES) and gamma-(2,3-epoxy propoxy)propyl trimethoxy silane (??560) as precursor, and then by hydrolysis and polymerization of SiO2/organic group composite material; and    (2) preparing a copper sulfide aluminum isolated film comprises: preparing a clean polyester film by washing the polyester film using de-ionized water, and ultrasonic cleaning using mixed solution of absolute ethyl alcohol, removing the surface grease and dirt, and dry in an oven; preparing solution of copper nitrate and aluminum nitrate and adjusting the pH value of the solution with diluted hydrochloric acid or ammonia water; preparing sodium sulfide solution and adjusting pH value of the solution with diluted hydrochloric acid or ammonia water; spraying the copper nitrate in the ultrasonic atomizing device and aluminum nitrate mixed solution; filtering the reaction solution to obtain the solid material, washing with de-ionized water and then with absolute ethyl alcohol and drying to obtain dry material; grinding the dry material to obtain nanometer copper sulfide aluminum powder; and preparing stable crystal phase structure of chalcopyrite phase powder containing copper aluminum sulfide, followed by granulating and adding alkyl methyl ammonium bromide to obtain alkyl methyl ammonium bromide solution; adding polyvinyl alcohol to obtain polyvinyl alcohol viscous liquid; adding a small amount of aluminum acetylacetonate in the mixed solution as chelating agent; preparing thick liquid using nanometer copper sulfide aluminum powder, alkyl methyl ammonium bromide solution and gel; coating the thick liquid on the clean polyester film substrate and drying to obtain polyester film support of solidified film, separating film and polyester to obtain the isolated film.