At present, the commonly used anode and cathode catalysts in proton exchange membrane fuel cells are platinum carbon black catalyst (Pt/C) or platinum black catalyst. Platinum carbon black is a supported catalyst dispersed by Pt nanoparticles onto the carbon black carrier, which is different from the traditional platinum carbon catalyst used in chemical industry (platinum load is less than 5%). The platinum carbon black catalyst used in hydrogen fuel cells has a platinum loading capacity of more than 20%, which is very difficult to prepare. Platinum carbon black catalysts for hydrogen fuel cells require platinum nanoparticles with a particle size of 2 ~ 5nm, narrow particle size distribution, and uniform dispersion on carbon. Because the surface energy of 2 ~ 5nm platinum nanoparticles is very large and easy to agglomerate, it is very difficult to prepare platinum carbon catalysts with a particle size of 2 ~ 5nm, narrow particle size distribution and uniform dispersion on the carbon, and special preparation process is required. The research focuses on the selection of cathode catalysts with higher activity and selectivity, and the direction of selection should take into account the catalyst materials with high activation, low toxicity, permeability resistance and low cost. The quality of electrocatalyst is mainly evaluated by the activity and stability of catalyst. By changing the performance of the carrier (specific surface area, pore structure, surface chemical properties, etc.), the content and particle size of the active metal in the catalyst, the macro and micro distribution of the active metal on the carrier, etc. The ability to prepare well-dispersed high-surface electrocatalysts containing platinum has greatly improved the feasibility of many electrochemical processes. This new process provides an excellent high-purity catalyst suitable for forming a highly uniform electrode structure.