The invention discloses an external coating of an electric tricycle seat armrest, and relates to the technical field of processing and production of electric vehicles. The external coating is characterized by being prepared from the following materials in parts by weight: 44 parts of acrylate resin, 1.5 parts of dispersant, 14.5 parts of anti-aging agent, 0.5 part of 2-amino-2-methyl-1-propanol, 3.5 parts of polybenzimidazole, 4 parts of vinyltriethoxysilane, 4 parts of bi-myristoleyl, 7 parts of ethyl acetate, 2 parts of diaminodiphenyl-methane, 2 parts of glycerol triacetate, 9 parts of additive, and 4 parts of deionized water. The external coating has the advantages that the method is reasonable, the operation is convenient, and the proportional ratio is reasonable.