TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): Preparation of the catalyst comprises (1) dispersing carbon nano-tube into a certain amount of concentrated nitric acid with a concentration of -40% to -70%, stirring the mixture and then heating and boiling for 30-60 minutes, filtering the boiled mixture and then washing, and drying the washed mixture at 20-60 degrees C, (2) dissolving palladium salt, copper salt, tin salt in glycol, ultrasonic stirring the dissolved mixture for 10 minutes to 3 hours to obtain solution of palladium salt, copper salt and tin salt corresponding to the total carbon nano-tube with mass ratio of 2-5:5-8, (3) ultrasonically dispersing the surface functional treatment of carbon nano-tubes in citric acid for 30 minutes to 5 hours, mixing the step (1) and (2) solution and then uniformly stirring, and ultrasonically dispersing the stirred solution for 1-10 hours, where the mole amount of the step A to solution of palladium salt, copper salt and tin salt is 6-10 times, (4) dissolving sodium borohydride in diluted sodium hydroxide solution having a pH value to 12-13, and uniformly stirring the dissolved solution to prepare reducing agent solution, and (5) slowly dripping reducing agent solution at 20-90 degrees C, keeping magnetic force or ultrasonic stirring, centrifuging the mixed solution, washing the precipitate with deionized water for 3-5 times and then drying at 30-10 degrees C, and grinding dried precipitate. Preferred Components: The carrier is multi-wall carbon nano-tube or single wall carbon nano-tube having a diameter of 20-100 nm. The palladium salt is palladium chloride, palladium nitrate, palladium acetate, ammonium tetrachloropalladate, and/or potassium tetrachloropalladate. The copper salt is copper chloride, or copper sulfate. The tin salt is stannous chloride, or stannous sulfate. Preferred Method: The step (5) is carried out at a temperature of 40-70 degrees C. The reducing agent solution is dripped at 30 drops/minute to -120 drops/minutes. The drying step is carried out at a temperature of 50-80 degrees C.