NOVELTY - Sulfonated polyether ether ketone-aminated silica microsphere hybridized film, comprises sulfonated polyether ether ketone and aminated silica microsphere in a mass ratio of (0.8-0.95):(0.2-0.05), where the sulfonation degree of sulfonated polyether ether ketone is 45-75%, and the thickness of the film is 55-80 mu m.    USE - The film is useful in carbon dioxide-methane separation (claimed).    ADVANTAGE - The film has high selectively of 30-64 and high permeability of 673-2043 Barrer for separating carbon dioxide-methane (all claimed).    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the film, comprising: (a) dispersing silica sphere having a diameter of 100-800 nm and tetraethyl orthosilicate-25% aqueous ammonia (both in a mass ratio of (0.5-10):1) in anhydrous ethanol by stirring under room temperature for 24 hours, adding 3-(trimethoxysilyl)propyl 2-methyl-2-propenoate into above solution (mass ratio of tetraethyl orthosilicate to 3-(trimethoxysilyl)propyl 2-methyl-2-propenoate is 1-20:1), stirring under room temperature for 24 hours, carrying out centrifugal washing with water for 3 times, then washing once with ethanol, drying to obtain double bond modified silica spheres, dispersing the double bond modified silica spheres, 4-vinylpyridine, styrene and 2,2-azobisisobutyronitrile (in a weight ratio of 15:(10-30):(10-30):1) in acetonitrile to obtain 1-5% suspension, adding the suspension into a reaction vessel, heating the suspension to boil for free-radical polymerization to form a polymer layer on silica microsphere, adjusting the thickness of the polymeric layer by controlling the reaction time, carrying out centrifugal washing and drying to obtain aminated silica microsphere; and (b) adding sulfonated polyether ether ketone into N,N-dimethylacetamide solvent, stirring at room temperature to obtain 5-15% sulfonated polyether ether ketone solution, performing ultrasonic dispersion of aminated silica microsphere in N,N-dimethylacetamide solvent for 12-36 hours, then adding into 10% sulfonated polyether ether ketone solution, stirring for 24 hours, allowing the solution to stand for 1-3 hours and degassing to obtain casting solution, pouring the casting solution into a glass dish and drying at 60 degrees C for 12 hours, then drying again at 80 degrees C for 12 hours to obtain the product.