TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): The preparation of (I) comprises (i) mixing a monomer mixture, quaternized polysulfone equal to 1/10-1/50 moles of the monomer, cuprous chloride equal to 1/10-1/50 moles of the monomer, aglucon equal to 1/5-1/25 moles of the monomer and solvent having volume equal to that of the monomer, removing oxygen from the mixed system and performing polymerization reaction, orderly using water and normal hexane to wash the reactant, drying the reactant to obtain a polymer, where the monomer mixture is fluoro acrylic monomer and acrylic acid monomer containing hydroxy or acrylic acid monomer potentially containing hydroxy, in a mass ratio of 1:5 to 5:1; (ii) when the monomer mixture refers to the fluoro acrylic monomer and acrylic acid monomer containing hydroxy, dissolving the polymer (5 g) in dry dioxane to prepare a solution with a mass percentage of 3-10%, then adding dry triethylamine (10.5 ml) and cuprous chloride (0.2 g); dropping diethyl chlorophosphate (10 ml) at 0 degrees C, reacting for 12 hours at room temperature and filtrating the reactant, adding the filtrate to normal hexane to precipitate, after precipitation, re-dissolving the mixture in chloroform, then adding normal hexane again to precipitate, secondarily washing the precipitate and vacuum drying to obtain phosphorylated polymer; or when the monomer mixture refers to fluoro acrylic monomer and acrylic acid monomer potentially containing hydroxy, dissolving the polymer in tetrahydrofuran to prepare a solution with a mass percentage of 3-10%, adding water until the system is suspended to form a hydrolysis reaction system; then dropping 0.5-5 N hydrochloric acid; stirring and performing hydrolysis to wash the product; performing vacuum drying to obtain the polymer comprising hydroxy; dissolving the polymer comprising hydroxy (5 g) in dry dioxane to prepare a solution with a mass percentage of 3-10%; then adding dry triethylamine (10.5 ml) and cuprous chloride (0.2 g); dropping diethyl chlorophosphate (10 ml) at 0 degrees C; performing reaction for 12 hours at room temperature; filtering the reactant; adding filtrate to normal hexane to precipitate; re-dissolving the precipitate in chloroform again; then adding normal hexane again to precipitate; secondarily washing the precipitate and performing vacuum drying to obtain phosphorylated polymer; (iii) dissolving the phosphorylated polymer obtained in a solvent having high boiling point, stirring and dissolving them to obtain the phosphorylated polymer solution with mass percentage of 2-15%; (iv) removing the impurities from the phosphorylated polymer film solution obtained in the step (iii) and removing bubbles, using cast method, smearing method or glue soaking method to produce the film on a horizontal and clean glass plate, drying the film and removing the film to obtain the phosphorylated polymer film; (v) placing the phosphorylated polymer film obtained in the step (iv) in concentrated hydrochloric acid to reflow and hydrolyze it; taken out the film and using water to wash; performing vacuum drying to obtain the phosphorylated polymer compound film. Preferred Method: The quaternized polysulfone in the step (i) is prepared by: reacting sulfoxide raw material having polymerization degree of 10-150 in chloromethylated system for 2-140 hours at 30-60 degrees C to obtain the chloromethylated polysulfone having 0.1-2 chloromethylate averagely on each polysulfone repeating unit, where the chloromethylated system is prepared from paraformaldehyde, trimethylchlorosilane and stannic chloride, or prepared from chloromethyl ether and anhydrous zinc chloride. The polymerization degree of the polysulfone is 60. The dissolving during stirring is dissolving for 2-5 hours during stirring at room temperature. The impurity removal and bubal removal in the step (iv) is ultrasonic treatment for 10-30 minutes. The impurities, after removing the bubbles, are removed using standard 200-mesh sieve to filtrate. The drying is performed for 1-3 hours at room temperature firstly, then is performed for 8-24 hours at 80 degrees C; then the product is cooled to room temperature. The used concentrated hydrochloric acid in the step (v) is 30-150 ml for each gram of phosphorylated polymer film. The time for reflowing and hydrolysis is 8-24 hours. The vacuum drying is performed for 6-16 hours at 30-60 degrees C until the weight is constant. Preferred Components: The fluoro acrylic monomer in the step (i) is trifluoroethyl methacrylate, hexafluorobutyl methacrylate, dodecylfluoroheptyl methacrylate, hexafluorobutyl acrylate, dodecylfluoroheptyl acrylate, tridecylfluorooctyl methacrylate or tridecylfluorooctyl methacrylate. The acrylic acid monomer containing hydroxy is hydroxyethylmethacrylate, hydroxyethyl acrylate, hydroxyethyl acrylate with trimethylchlorosilane or glycidyl methacrylate. The acrylic acid monomer potentially containing hydroxy is hydroxyethyl methacrylate terminated by trimethylchlorosilane. The aglucon is pentamethyldiethylenetriamine or 4,4'-bipyridyl. The solvent is dimethylformamide (preferred), N-methyl pyrrolidone, toluene or tetrahydrofuran. The reaction temperature of the polymer is at 45-110 degrees C and the reaction time is 12-24 hours. The drying refers to vacuum drying for 6-16 hours at 30-60 degrees C until the weight is constant. The concentration of the solution in the step (ii) is 5 mass-%. Hydrochloric acid (0.5-5 ml) is added to each liter of hydrolysis reaction system. The hydrolysis reaction time is 3-5 hours. The vacuum drying is performed for 6-16 hours at 30-60 degrees C until the weight is constant. The solvent having high boiling point in the step (iii) is dimethylformamide (preferred) or N-methyl pyrrolidone.