NOVELTY - Preparation of fuel cell cathode catalyst involves adding niobium oxide powder to 0.08-0.09 %mass carbon source of ethylene glycol, ultrasonically processing at 400-600 W for 30-50 minutes, stirring at 360-540 rpm for 6-12 hours, adjusting pH of resultant mixture to 10-12 using sodium hydroxide solution, stirring at 360-540 rpm for 12-16 hours, purging argon for 20-30 minutes, heating using microwave for 55-70 seconds, cooling to room temperature, stirring, adjusting pH to 0.5-1, stirring, adding to water, mixing at 80-100 degrees C and freeze-drying at -30 degrees C to -50 degrees C for 10-16 hours.    USE - Preparation of fuel cell cathode catalyst (claimed).    ADVANTAGE - The method enables preparation of fuel cell cathode catalyst with three-phase boundary structure having excellent stability.    DETAILED DESCRIPTION - Preparation of fuel cell cathode catalyst involves dissolving niobium precursor in anhydrous ethanol, obtaining niobium salt solution, dripping 1-3 mol/L ammonia, stirring at 360-540 rpm for 90-120 minutes, centrifuging, washing using water, separating precipitate, adding 0.5-1 mol/L oxalic acid, centrifuging, cleaning, obtaining niobium hydroxide, drying at 60-70 degrees C for 8-12 hours, placing in tube furnace, heating to 900-1050 degrees C at heating rate of 5-8 degrees C/minute, heat-preserving at 900-1050 degrees C for 10-14 hours, milling, obtaining niobium pentoxide, dissolving in high-purity water, obtaining niobium pentoxide aqueous solution, adding to reactor, adding hydrazine hydrate, stirring, sealing, reacting at 200-240 degrees C for 15-20 hours, precipitating, vacuum-drying at 20-25 degrees C for 8-12 hours, adding niobium oxide powder to 0.08-0.09 %mass carbon source of ethylene glycol, ultrasonically processing at 400-600 W for 30-50 minutes, stirring at 360-540 rpm for 6-12 hours, adjusting pH of resultant mixture to 10-12 using sodium hydroxide solution, stirring at 360-540 rpm for 12-16 hours, purging argon for 20-30 minutes, heating using microwave for 55-70 seconds, cooling to room temperature, stirring, adjusting pH to 0.5-1, stirring at 360-540 rpm for 12-18 hours, adding to water, mixing at 80-100 degrees C and freeze-drying at -30 degrees C to -50 degrees C for 10-16 hours. The molar ratio of ammonia and niobium salt solution is 1:1-20. The molar ratio of niobium pentoxide and water is 0.5:20-30. The mass ratio of niobium pentoxide aqueous solution and hydrazine hydrate is 0.5:15-18. The carbon source of ethylene glycol is obtained by dissolving carbon in ethylene glycol solution. The carbon is graphite or XC-72 carbon black. The mass ratio of niobium oxide powder and carbon source of ethylene glycol is 1:1.