NOVELTY - Preparing high-stability and high-activity carbon-supported platinum-based catalyst comprises (i) cleaning and removing impurities on the surface of the carbon carrier or carrying out oxidization treatment of the carbon carrier; (ii) mixing the carbon carrier with heterocyclic compound containing carbon and nitrogen, adding deionized water and an organic solvent, ultrasonic processing, reacting, filtering, washing and vacuum drying to obtain the carbon carrier with carbon and nitrogen containing heterocyclic structure; and (iii) adding platinum salt solution and processing.    USE - The carbon-supported platinum-based catalyst is useful for fuel cell (claimed).    ADVANTAGE - The catalyst: solves the problem of poor circulating stability, difficulty in preparation process, high energy consumption and environment pollution; has small particle size of 1-2 nm, good dispersibility, electrochemical active area of 88 m2/g platinum and change rate of 12% after being aged for 1000 circles; and has oxidation reduction reaction activity ik of 356 A/g platinum when the voltage is 0.8V (vs.reversible hydrogen electrode) and the change rate of 4% after being aged for 1000 circles.    DETAILED DESCRIPTION - Preparing high-stability and high-activity carbon-supported platinum-based catalyst comprises (i) cleaning and removing impurities on the surface of the carbon carrier or carrying out oxidization treatment of the carbon carrier; (ii) mixing the carbon carrier with heterocyclic compound containing carbon and nitrogen, adding deionized water and an organic solvent, where the mass ratio of the carbon carrier and the heterocyclic compound containing carbon and nitrogen is 1:(1-100), the mass to volume ratio of the carbon carrier and deionized water is 1 g:(80-100) ml, and the volume ratio of the organic solvent and deionized water is 1:1, processing at the ultrasonic frequency of 50-60 KHz for 0.5-1.5 hours, stirring at the speed of 100-500 revolutions/minute for 1.5-2.5 hours under room temperature, adjusting the pH to 1-4 or 8-12, transferring to a hydrothermal reaction kettle, introducing inert gas for 20-40 minutes, reacting for 1-24 hours at 100-200 degrees C, cooling to room temperature, filtering, washing the solid material with water for 4-6 times, vacuum drying at 70-90 degrees C for 4-6 hours, completing the introducing of heterocyclic compound containing carbon and nitrogen and obtaining the carbon carrier with carbon and nitrogen containing heterocyclic structure, where the heterocyclic compound containing carbon and nitrogen is vitamin B compounds and the resistivity of the washing water is 16-18.25 M Omega x cm; and (iii) adding an organic solvent into carbon carrier with carbon and nitrogen containing heterocyclic structure of volume to mass ratio (60-40) ml:40 mg, processing at the ultrasonic frequency of 50-60 KHz for 0.5-1.5 hours, stirring at the speed of 100-500 revolutions/minute for 3.5-4.5 hours under room temperature, adding platinum salt solution, where the volume to mass ratio of platinum salt solution and the carbon carrier is (1-2) ml:40 mg, continuously stirring at a speed of 100-500 revolutions/minute for 11-13 hours, adjusting pH to 9-12 to obtain the mixed solution, filling inert gas in the mixed solution for 20-40 minutes, heating in a microwave oven from room temperature to 150-170 degrees C, cooling the mixed solution to room temperature and adjusting the pH to 3-4, filtering, vacuum drying the solid substance at 70-90 degrees C for 4-6 hours, where the organic solvent is ethylene glycol and isopropyl alcohol of volume ratio (3-5):1, and the concentration of platinum in the platinum salt solution is 35-40 mmol/ml.