NOVELTY - Noble metal nano-catalyst comprises metal nano-particles and organic azo dye functionalized carbon carrier according to the mass ratio of 1-5:10. The catalyst is formed by depositing the metal nano particles on the organic azo dye functionalized carbon carrier.    USE - Used as noble metal nano-catalyst.    ADVANTAGE - The catalyst has high load rate of metal particles and controllable load; includes load noble metal particles with different particle sizes, metal particles and carbon nano-material connected by a nitrogen-containing chemical bond, which enhances the interaction of the metal nanoparticles and the carbon and improves the catalytic activity of the nano particles; and has high utilization rate. The method is economical, non-toxic, and simple technique; and has less equipment requirements and produces noble metal nano-catalyst with good catalytic activity and stability.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the noble metal nano-catalyst, comprising (i) according to weighing organic dye, carbon nano-material and solvent according to mass ratio of 1-6:20-30:6000-12000, adding a solvent to the organic azo dye and carbon nano material, uniformly mixing 0.1-0.5 hours under ultrasonic condition, placing the mixture under ultraviolet light of wavelength of 254-365 nm for 2-12 hours with stirring at a rate of 60-300 revolutions/minute, filtering, washing with double distilled water, and drying under vacuum at 40-100 degrees C for 1-4 hours to obtain surface-functionalized carbon carrier; (ii) weighing double distilled water, acetone, polyethylene glycol-400 and the noble metal salt or acid solution according to the mol ratio of double distilled water, acetone and polyethylene glycol-400 and the noble metal ion of 150-300:3.2-6.4:11.25-33.75:0.006-0.008, adding acetone and polyethylene glycol-400 to the noble metal salt or acid solution, adding double distilled water, shaking, placing 20-50 ml of the mixture under the UV irradiation with wavelength of 254-365 nm for 10-50 minutes to obtain metal colloids with particle size of 4-7 nm; and (iii) mixing the metal colloids of step (ii) and surface surface-functionalized carbon carrier according to the mass ratio of 1-5:10, stirring for 50-70 minutes, filtering, and vacuum drying at 50-70 degrees C for 90-120 minutes.