Preparation method of carbon dioxide electroreduction catalyst

The invention relates to the field of carbon dioxide electroreduction catalysts, and discloses a preparation method of a carbon dioxide electroreduction catalyst, which comprises the following steps: carrying out hydrothermal reaction on a copper precursor, an organic ligand, inorganic alkali and alkali metal salt to obtain a copper-organic ligand polymer; mixing the copper-organic ligand polymer with an isopropanol solution and a binder, and dispersing to obtain a polymer dispersion liquid; placing the polymer dispersion liquid on the surface of an electrode, airing the polymer dispersion liquid, putting the electrode into a carbon dioxide electrolytic tank, and treating the electrode under reduction potential to obtain an organic ligand modified copper nanoparticle catalyst; wherein the organic ligand is isonicotinic acid or functional group substituted isonicotinic acid. The Faraday efficiency ratio of the C2 product (ethylene and ethanol) to the C1 product (carbon monoxide, formic acid and methane) in the