TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): Preparing the completely sulfonated polyimide and partially sulfonated polybutadiene block copolymer where the materials are counted by mass parts comprises:(a) dissolving 1-10 parts of carboxyl-terminated polybutadiene into 30-50 parts of toluene, adding 1-10 parts of thionyl dichloride, and agitating evenly; under the protection of nitrogen, heating up to 60-80 degrees C, after reacting for 1-3 hours, heating up to 90-110 degrees C, continuing reacting for 10-20 hours; after finishing reaction, cooling, decompressing and distilling to remove the residual thionyl dichloride, obtaining the toluene solution of acyl chloride-terminated polybutadiene;(b) adding 4,4'-diaminodiphenyl ether (4-8 parts) into the round flask put in ice bath, slowly dripping concentrated sulfuric acid (20-40 parts), dripping fuming sulphuric acid with a mass concentration of 50% when the solid is dissolved completely, stirring the mixed solution for 2 hours, heating to 80-100 degrees C and continuously reacting for 5-10 hours, cooling, slowly pouring the same into a mixture of ice and water to obtain a large amount of white deposition, then dissolving the deposition obtained by filtering into sodium hydroxide solution, removing impurities, and dripping concentrated hydrochloric acid into the filtrate until generating deposition again, washing with deionized water and an alcohol solvent, and drying in vacuum to obtain sulfonated 4,4'-diaminodiphenyl ether;(c) adding sulfonated 4,4'-diaminodiphenyl ether (2-2.5 parts), triethylamine (1-1.5 parts) and metacresol (30 parts), and stirring, then adding 1,4,5,8-naphthalene tetracarboxylic dianhydride (1.5-2 parts) and benzoic acid (1-1.5 parts) and heating to 80-100 degrees C, reacting for 2-4 hours under the protection of nitrogen, heating to 180-190 degrees C and reacting for 16-20 hours, then cooling reaction solution, pouring the reaction solution into acetone, stirring, and washing the coarse product three times with acetone, and drying to obtain amino terminated completely sulfonated polyimide;(d) adding the amino terminated completely sulfonated polyimide (1-3 parts) and triethylamine (0.1-1 parts) into a mixed organic solvent (30-40 parts), dripping a toluene solution (1-6 parts) of acyl chloride group terminated polybutadiene, reacting for 6-18 hours at 50-70 degrees C, cooling reaction solution, pouring into acetone (200 parts) to deposit, and orderly washing the deposition with deionized water and acetone after filtering, drying in vacuum to obtain completely sulfonated polyimide and polybutadiene block copolymer, wherein the mass concentration of the mixed organic solvent is the solution of dimethyl sulfoxide of N-methyl-2-pyrrolidone of 50-70%;(e) slowly dripping concentrated sulfuric acid (15-20 parts) into acetic anhydride (15-20 parts) under the condition of ice bath, continuously stirring, and reacting for 6-12 hours to obtain acetyl sulphonate; and(f) dissolving the completely sulfonated polyimide and polybutadiene block copolymer (1-3 parts) into dimethyl sulfoxide (30 parts), stirring, dripping acetyl sulphonate (1-5 parts), heating to 70-100 degrees C and reacting for 9-18 hours under the protection of nitrogen, pouring the mixed solution into an alcohol solvent (200 parts) when the reaction is ended, regulating the solution to neutral by adding NaOH, then filtering and washing the coarse product with the alcohol solvent (50 parts) after, washing with deionized water, and drying in vacuum to obtain the completely sulfonated polyimide and partially sulfonated polybutadiene block copolymer of Formula (II).p=50-80.