Abstract: The present invention provides a preparation method for a nitrogen-doped carbon-loaded metal monatomic catalyst, including: mixing a soluble metallic salt, a hydroxylamine hydrochloride, a soluble carbon source, water, and ethanol, to obtain a mixed solution, then performing drying and precipitation, to obtain a catalyst precursor, and finally performing calcination, to obtain a nitrogen-doped carbon-loaded metal monatomic catalyst. In the present invention, the metallic salt, the hydroxylamine hydrochloride, and the carbon source are fully mixed in the solution, and after being dried, are calcined, to carbonize the carbon source, so that ammonium ions are decomposed into nitrogen-doped carbon, and meanwhile, metal atoms are loaded onto the nitrogen-doped carbon. The method is simple, and costs are low.