▎ 摘　　要

NOVELTY - Synthesizing supported high-load carbon-coated precious metal nanoparticle catalyst comprises (i) dispersing substrate in an aqueous solution of sodium laurate, and ultrasonically stirring to make the dispersion uniform; (ii) adding precious metal cation solution to the solution and freeze-drying; (iii) dispersing the solution and washing product with water after pyrolysis at high temperature, where, in the step (i) substrate d is graphene oxide or Ketjen black, in the step (ii), the precious metal cation solution is an aqueous solution of platinum tetrachloride, ruthenium trichloride or iridium trichloride and in the step (iii), the high temperature pyrolysis is carried out at 180-200degrees Celsius for 1-3 hours under nitrogen atmosphere, and 400-450degrees Celsius for 2-3 hours. USE - The method is useful for synthesizing supported high-load carbon-coated precious metal nanoparticle catalyst. ADVANTAGE - The method can in situ grow a variety of monodisperse high-load carbon-coated noble metal catalysts on the substrate; is simple; ensures catalyst particle size is small, and the loading capacity is high; and overcomes the problems of low loading of precious metal catalysts and easy sintering with high loading in the existing method; and expands the method for high loading of precious metals.