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The invention discloses a strong-acid-corrosion-resistant carbon-loaded platinoid all-alloy nano material and a preparation method thereof, and relates to the technical field of new energy materials. The preparation method of the carbon-loaded platinoid all-alloy nano material comprises the following steps: dispersing a carbon carrier in a solvent, adding platinum and copper precursors, dispersing, and adsorbing at constant temperature to obtain a suspension mixed solution; drying by distillation, drying and grinding to obtain a solid compound; calcining in an inert atmosphere, and cooling to obtain a carbon-supported platinoid material; and carrying out strong acid corrosion treatment, washing, drying and grinding to obtain the strong acid corrosion resistant carbon-loaded platinoid all-alloy nano material. The prepared material can keep the crystal structure stable in a strong acid environment and has excellent acid corrosion resistance, and the platinum-copper nano material takes platinum as a solvent and copper as a solute to form a complete alloy phase with the atomic ratio of copper to platinum being greater than or equal to 1: 1. When the material is used as an oxygen reduction catalyst, the atom utilization rate of platinum is high, and meanwhile, the oxygen reduction reaction catalytic activity and long-term stability of the material are remarkably improved.