NOVELTY - A cationic surfactant and carrier are dissolved in solvent such as polyhydric alcohol, ultrasonic processing and stirring are performed, to obtain reaction mixture. The metal precursor salt is added to the reaction mixture, to obtain mixed slurry. The obtained mixed slurry is subjected to microwave heating to complete the reaction, microwave heating temperature is controlled at 80-160 degrees C, filtered, washed and dried, to obtain nano-crystal structure proton exchange membrane fuel cell catalyst.    USE - Preparation of nano-crystal structure proton exchange membrane fuel cell catalyst (claimed).    ADVANTAGE - The nano-crystal structure proton exchange membrane fuel cell catalyst is economically prepared.    DETAILED DESCRIPTION - A cationic surfactant and carrier are dissolved in solvent such as polyhydric alcohol, ultrasonic processing and stirring are performed, to obtain reaction mixture. The metal precursor salt is added to the reaction mixture, to obtain mixed slurry. The obtained mixed slurry is subjected to microwave heating to complete the reaction, microwave heating temperature is controlled at 80-160 degrees C, filtered, washed and dried, to obtain nano-crystal structure proton exchange membrane fuel cell catalyst. The concentration of cationic surfactant in the mixture is 0.5-3 times. The carrier is graphite, carbon nanotube, XC-72 carbon black, mesoporous carbon or carbon fiber. The cationic surfactant is hexadecyl trimethyl ammonium bromide, dodecyl dimethyl tertiary amine acetate, such as imidazoline, morpholine guanidine and triazine derivative. The amount of metal element in the metal precursor salt is 10-60%. The metal precursor salt is palladium acetate (Pd(C2H3O2)2), palladium chloride, platinum chloride, gold chloride, silver nitrate, iridium chloride, rhodium chloride, sodium platinum chloride, sodium palladium chloride, potassium platinum chloride, dihydrogen tetrachloropalladate, chloroauric acid, chloroiridic acid, chloroplatinic acid, potassium palladium chloride, potassium gold chloride, sodium tetrachloroaurate dehydrate, sodium hexachloroiridate or potassium hexachloroiridate.