TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): The preparation of phosphorylation polymer composite membrane comprises:(A) mixing monomer mixture, initiator comprising alkynyl with monomer molar weight of 1/10-1/50, cuprous bromide with monomer molar weight of 1/10-1/50, glycoside with monomer molar weight of 1/5-1/25 and solvent, the monomer mixture comprising propylene ester monomer comprising fluorine and (methyl) propylene ester monomer at mass ratio of 1:5-5:1, deoxidizing mixed system and carrying out polymerization, sequentially washing reaction product with water and n-hexane, and drying to obtain polymer comprising alkynyl;(B) dissolving chloromethylated polysulfone (5 g) in N,N-dimethyl formamide (25-100 ml), adding sodium azide (0.5-5 g), evaporating to remove N,N-dimethyl formamide, dissolving remaining methylene chloride, adding methylene chloride solution into methyl alcohol, washing precipitation with methyl alcohol, and vacuum drying to obtain polysulfone containing azide group;(C) mixing polysulfone (5 g) comprising azide, copolymer comprising alkynyl (0.6-12 g), cuprous bromide (50-1000 mg) and glycoside (60-1200 mg), adding N,N-dimethyl formamide (5-50 mg), deoxidizing mixed system and reacting, passing reaction product through neutral oxidized aluminum column, removing unreacted copolymer through dialysis and purification, dialyzing product and evaporating to remove solvent, and vacuum drying to purified copolymer;(D) dissolving copolymer in tetrahydrofuran to prepare solution with weight ratio of 3-10%, adding water, dropwise adding 1 N hydrochloric acid, mixing and reacting, washing product with water, and vacuum drying to obtain copolymer comprising hydroxyl;(E) dissolving copolymer comprising hydroxyl (5 g) in dried dioxane to prepare solution with mass ratio of 3-10%, adding dried triethylamine amine (10.5 ml) and cuprous chloride (0.2 g), dropwise adding chlorine diethyl phosphoric acid (10 ml) at 0 degrees C, reacting for 12 hours at room temperature, filtering reaction product, adding filtrate into n-hexane to precipitate, adding into n-hexane to precipitate again, washing precipitate for two times, and vacuum drying to obtain phosphorus esterification polymer;(F) dissolving phosphorus esterification polymer in high boiling point solvent to prepare copolymer solution with mass ratio of 2-15%, stirring and dissolving to obtain phosphorus esterification polymer solution;(G) removing impurities in phosphorus esterification polymer, removing foam, making membrane on horizontal clean glass board by using casting method, pasting method or gum dipping method, and demolding in water to obtain phosphorus esterification polymer membrane;and(H) putting phosphorus esterification polymer membrane into concentrated hydrochloric acid for backflow hydrolysis, taking out polymer, washing with water, and vacuum drying to obtain phosphorylation polymer composite membrane.Preferred Components: The propylene ester monomer comprising fluorine is trifluoromethyl methacrylate, hexafluorobutyl methacrylate, dodecafluoroheptyl methacrylate, hexafluorobutyl acrylate, dodecafluoroheptyl methacrylate, hexafluorobutyl acrylate, dodecafluoroheptyl methacrylate, perfluorooctyl methacrylate or perluorooctyl acrylic acid; the (methyl) propylene ester monomer is hydroxyethyl acrylate of trimethyl chlorosilane dead end, ethyl acrylate of trimethyl chloro silane end or glycidyl methacrylate; the initiator-containing alkynyl is isopropyl 2-bromo-2-methylpropanoate allylene alcohol ester; the glycoside is (pentamethyl)diethylenetriamine or 4,4'-dipyridine; and the solvent is cyclohexanone (preferably), butanone, dimethylformamide, N-methylpyrrolidone, methylbenzene or tetrahydrofuran. The mass fraction of solution concentration is 5%; the amount of hydrochloric acid is 0.5-5 ml into 1 L hydrolysis reaction system. The high boiling point solvent is dimethylformamide (preferably) or N-methylpyrrolidone. The concentrated hydrochloric acid is 30-150 ml for each gram of phosphorylation polymer composite membrane. Preferred Processes: The chloromethylated polysulfone is prepared by reacting polysulfone raw material with degree of polymerization of 10-150 in chloromethylate system at 30-60 degrees C for 2-140 hours to obtain chloromethylated polysulfone with average of 0.1-2 chloromethyl groups in each polysulfone repetitive unit; the chloromethylate system is mixed by paraformaldehyde, trimethyl chloro silane and stannic chloride, or mixed by chloromethyl ether and anhydrous zinc chloride; and reacting at 60-90 degrees C for 12-24 hours with pentamethyldiethylenetriamine, and at 20-35 degrees C for 12-48 hours. The time of the hydrolysis reaction is 3-5 hours; the vacuum drying is at 30-60 degrees C for 6-16 hours to constant weight; and the mass fraction of solution concentration is 5%; and the vacuum drying is at 30-60 degrees C for 6-16 hours to the constant weight. The temperature of the polymer reaction is 60-90 degrees C; the reaction time is 3-24 hours; and the drying is vacuum drying at 30-60 degrees C for 6-16 hours to the constant weight. The degree of polymerization of polysulfone raw material is 60. The dissolving while stirring is at room temperature for 2-5 hours; the removal of the impurities foam utilizing ultrasonic treatment for 10-30 minutes, removing foam and filtering with standard sieve of 200-mesh to remove impurities; and drying treatment is carried out at room temperature for 1-3 hours, and drying at 80 degrees C for 8-24 hours and cooling to the room temperature. The time of backflow hydrolysis is 8-24 hours; and the vacuum drying is carried out at 30-60 degrees C for 6-16 hours to constant weight.