NOVELTY - Forming nano-platinum catalyst on nano-size silicon dioxide involves adding a powder of nano-size silicon dioxide, into a solution of ethylene glycol; processing ultrasonic vibration and high speed agitation, followed by adding a solution of ethylene glycol having an electro-catalyst precursor; processing high speed agitation to obtain a mixed solution; and heating the mixed solution at 160 plus minus 10 degrees C to remove hydrogen and chlorine in electro-catalyst precursor and to adhere metal catalyst particles in the electro-catalyst precursor to silicon dioxide, followed by hot-drying.    USE - For forming nano-platinum catalyst on nano-size silicon dioxide (claimed), where the catalyst is useful for fuel cells, organic compound reactions and textile industry, and in direct methanol fuel cell (DMFC) and proton exchange membrane fuel cell (PEMFC).    ADVANTAGE - The method by chemical reduction, reduce platinum complex ions to nano-size clusters and adhere platinum complex ions on the nano-SiO2 powder. Thus, adhesion and absorption of the platinum catalyst particles in SiO2 is increased. Through doping SiO2 (having a smaller adhesion than carbon nanotube) and ethylene glycol, ethylene glycol is easily removed through hot-drying in vacuum after the reduction at the high temperature. Thus the obtained catalyst has high activity and wide application.    DETAILED DESCRIPTION - Manufacturing a nano-platinum (Pt) catalyst on nano-size silicon dioxide (SiO2) involves adding a powder of SiO2 having a scale of nanometers, into a solution of ethylene glycol; processing ultrasonic vibration and high speed agitation to obtain a paste of SiO2; adding a solution of ethylene glycol having an electro-catalyst precursor into the paste of SiO2; processing high speed agitation to obtain a mixed solution; heating the mixed solution at 160 plus minus 10 degrees C to remove hydrogen and chlorine in the electro-catalyst precursor and to adhere metal catalyst particles in the electro-catalyst precursor to SiO2 to obtain a powder of SiO2; hot-drying the powder of SiO2 in vacuum with ethylene glycol being removed; washing the powder of SiO2 using de-ionized water with remaining ethylene glycol being removed; and hot-drying the powder of SiO2 in vacuum with de-ionized water being removed.