NOVELTY - Montmorillonite-supported platinum catalyst preparation involves adding deionized water into sodium montmorillonite at 60 degrees C to obtain mixture. The obtained mixture is ultrasonically stirred for 30 minutes to prepare sodium montmorillonite suspension with concentration of 0.05 g/ml. Cetyltrimethylammonium bromide is added into the sodium montmorillonite suspension to obtain a mixed product. The mixed product is stirred at 60 degrees C for 20 minutes. The stirred product is refluxed at 100 degrees C for 24 hours.    USE - Method for preparing montmorillonite-supported platinum catalyst (claimed).    ADVANTAGE - The method provides montmorillonite-supported platinum catalyst, which has good stability and high redox activity.    DETAILED DESCRIPTION - Montmorillonite-supported platinum catalyst preparation involves adding deionized water into sodium montmorillonite at 60 degrees C to obtain mixture. The obtained mixture is ultrasonically stirred for 30 minutes to prepare sodium montmorillonite suspension with concentration of 0.05 g/ml. Cetyltrimethylammonium bromide is added into the sodium montmorillonite suspension to obtain a mixed product. The mixed product is stirred at 60 degrees C for 20 minutes. The stirred product is refluxed at 100 degrees C for 24 hours. The refluxed product is cooled to 60 degrees C, and then the cooled product is filtered to obtain a filtrate. The filtrate is washed with deionized water, and then the washed filtrate is dried. The dried filtrate is ground to obtain organic cation modified montmorillonite. The organic cation modified montmorillonite is added into deionized water to obtain a mixture. The obtained mixture is ultrasonically stirred to prepare organic cation modified montmorillonite suspension with the mass concentration of 0.01-0.1g/ml. Perfluorinated sulfonic resin solution is added into the organic cation modified montmorillonite suspension to obtain a mixed product. The mixed product is ultrasonically stirred at 30-80 degrees C for 5-24 hours. The stirred product is cooled to room temperature to obtain organic cation modified montmorillonite suspension of perfluorinated sulfonic resin. Tetraammineplatinum(II) chloride is added into the organic cation modified montmorillonite suspension of perfluorinated sulfonic resin to obtain a mixture. The mixture is ultrasonically stirred at 20-60 degrees C for 12-36 hours to obtain a suspension. Glycol is added into the suspension, and then the suspension is continuously stirred at room temperature for 4-12 hours. The stirred suspension is cooled to room temperature, and then washed with deionized water. The washed suspension dried, and then the dried suspension is ground to obtain platinum-intercalation montmorillonite catalyst. The platinum-intercalation montmorillonite catalyst is dissolved in absolute ethyl to obtain paltinum-intercalation montmorillonite catalyst suspension with the mass concentration of 0.01-0.1g/ml. Carbon powder into the paltinum-intercalation montmorillonite catalyst suspension to obtain a mixed product. The mixed product is dispersed uniformly, and then hydrofluoric acid is added into the dispersed product. The product is ultrasonically stirred for 10-50 minutes. The stirred product is washed with deionized water. The washed product is dried, and then dried product is ground to obtain platinum-intercalation montmorillonite fuel cell cathode catalyst.