NOVELTY - A direct methanol fuel cell sulfur-doped carbon nanotubes supported platinum catalyst preparing method involves adding acidified multi-walled carbon nanotubes (MWCNTs) in water, adding sodium dodecyl sulfate and 3,4-ethylene dioxythiophene monomers, adding ammonium persulfate aqueous solution, centrifuging resulting products, washing to give functionalized poly(3,4-ethylenedioxythiophene)-multi-walled carbon nanotubes composite. The functionalized sample is placed in furnace followed by adding ethylene glycol, sulfur-doped MWCNTs and chloroplatinic acid solution, washing and drying.    USE - Method for preparing direct methanol fuel cell sulfur-doped carbon nanotubes supported platinum catalyst.    ADVANTAGE - The platinum catalyst can be prepared in simple and mild controllable operating conditions, exhibits electrocatalytic activity, high stability and resistance to carbon monoxide poisoning and strong features.    DETAILED DESCRIPTION - A direct methanol fuel cell sulfur-doped carbon nanotubes supported platinum catalyst preparing method involves adding acidified multi-walled carbon nanotubes (MWCNTs) in distilled water, placing in a container, adding sodium dodecyl sulfate and 20-300 mu l 3,4-ethylene dioxythiophene monomers, dropwise and stirring at room temperature for 2 hours, adding 5 mg ml-1 ammonium persulfate aqueous solution, stirring continued for 24 hours, centrifuging resulting products, washing and drying in vacuo to give functionalized poly(3,4-ethylenedioxythiophene)-multi-walled carbon nanotubes composite. The functionalized sample is placed in a tube furnace for heat treatment under nitrogen for 3 hours to obtain sulfur-doped multi-walled carbon nanotubes composites, followed by adding 20 mL ethylene glycol in a mass ratio of Pt/S-doped MWCNTs of, sulfur-doped MWCNTs and 19.3 mM chloroplatinic acid solution, sonicating for two hours into 25 mL autoclave, at 90 degrees C for 24 hours, centrifuging the reaction product, washing and drying under vacuum to obtain catalyst. An INDEPENDENT CLAIM is also included for direct methanol fuel cell sulfur-doped carbon nanotubes supported platinum catalyst prepared by the method.