The invention provides a mesoporous carbon-tungsten carbide composite material platinum-supporting catalyst preparation method, and belongs to the technical field of inorganic material preparation. The preparation method comprises: preparing a tungsten electrode, inflating, opening a plasma heating reaction, collecting a product, loading platinum, and other steps. According to the present invention, the preparation method has advantages of simple preparation process, short preparation time, environmentally friendly preparation process, high yield, low preparation cost and the like; the mesoporous carbon-tungsten carbide nano-sphere composite structure is prepared through the one-step method, such that the agglomeration phenomenon of the tungsten carbide nanoparticles is substantially reduced; the prepared tungsten carbide nano-sphere particles have advantages of small particle size, narrow particle size distribution, good crystallinity and good monodispersity; and the synergistic effect and the structural effect of the prepared composite catalyst further improve the catalytic performance and the anti-oxidation performance.