NOVELTY - Preparation of organic-inorganic compound polymer comprises packing, modifying and disposing nanometer titania with polyacrylic acid by latex polymerization, and then copolymerizing the surface of the modified nanometer titania particle with acrylonitrile and acrylonitrile methyl ester by solution polymerization to obtain the organic inorganic compound polymer.    USE - Preparation of an organic-inorganic compound polymer for use as polymer electrolyte material of a lithium ion secondary battery (claimed).    ADVANTAGE - The process has strong operation performance, lower costs, and stable product quality. The polymer product has good ion conductivity and mechanical performance.    DETAILED DESCRIPTION - Preparation of organic-inorganic compound polymer comprises packing, modifying and disposing nanometer titania with polyacrylic acid by latex polymerization. The raw material nanometer titania, emulsifying agent and deionized water are mixed to form latex under room temperature. The latex is heated up to reaction temperature. Sodium acid sulfite and initiator ammonium persulfate are separately added. Acrylonitrile methyl ester monomer is added. The product is broken emulsion by saturated salt water, centrifuged to separate the solid, washed and then placed in an oven to roast the product to obtain nanometer titania modified by acrylonitrile methyl ester. The ratio of nanometer titania and deionized water is 1:20-1:200. The ratio between emulsifying agent and nanometer titania is 0.5:100-1.5:100. The mole ratio between sodium acid sulfite and nanometer titania is 0.025:1-0.045:1. The dose of ammonium persulfate is 0.5-1.5% of the amount of acrylonitrile methyl ester monomer. The reaction temperature is 60-90degrees C. The reaction time is 0.5-4 hours. The copolymer of acrylonitrile and acrylonitrile methyl ester is prepared by solution polymerization under nitrogen protection. The modified nanometer titania is added into solvent, ultrasonically dispersed, and added with organic acrylonitrile, acrylonitrile methyl ester and initiator to polymerize. Then, the copolymer of polydiethylene glycol monoacrylate and initiator are added to the polymerization reaction to obtain the copolymer of acrylonitrile and acrylonitrile methyl ester polymerized on the modified titania surface. The solvent is 1-methyl-2-pyrrolidone or dimethyl formamide. The ratio between acrylonitrile and acrylonitrile methyl ester is 1:3-3:1. The polymerization reaction temperature is 50-80degrees C. The reaction time is 2-48 hours. The polydiethylene glycol monoacrylate is the cross-linking agent. The dose of the polydiethylene glycol monoacrylate is 10-25% of the monomer amount. The dose of the initiator is 0.5-2% of the amount of polydiethylene glycol monoacrylate. The time of polymerization reaction is 4-12 hours.