The invention relates to a protective coating inside a handlebar of an electro-tricycle, which relates to the technical field of the processing and production of electric vehicles. The protective coating is characterized by being prepared from the following materials in parts by weight: 46 to 52 parts of isophthalic polyester resin, 3 to 5 parts of carboxymethyl cellulose, 1 to 2 parts of 1-methyl anyl alcohol, 2 to 6 parts of titanium dioxide powder, 3 to 6 parts of isopropyl alcohol, 3 to 6 parts of rosin, 1 to 3 parts of dicumyl peroxide, 4 to 7 parts of butadiene, 1 to 4 parts of 1-hydroxy cyclohexyl phenyl ketone, 1 to 2 parts of lead acetate, 10 to 15 parts of anti-aging agent, 5 to 9 parts of additives, and 4 to 8 parts of deionized water. The protective coating has the advantages of reasonable method, convenient operation and reasonable proportion.