The invention relates to the technical field of fireproofing, in particular to a fireproof coating for a copper-clad aluminum busbar. The fireproof coating is prepared from raw materials in parts by weight as follows: 45-60 parts of bisphenol A epoxy vinyl ester resin, 15-20 parts of carbamate, 20-30 parts of toluene diisocyanate, 10-15 parts of acrylic resin, 15-20 parts of antimony trioxide powder, 5-10 parts of ammonium polyphosphate, 10-15 parts of sodium hexametaphosphate, 2-4 parts of dibutyl phthalate, 10-16 parts of mica powder, 8-12 parts of asphalt, 7-12 parts of a reactive diluent,0.3-0.6 parts of a leveling agent and 30-50 parts of water. The fireproof coating can be tightly combined with the copper-clad aluminum busbar and has good fireproof and flame-retardant effects, meanwhile, the bisphenol A epoxy vinyl ester resin can act with carbamate and toluene diisocyanate, so that corrosion resistance, flexibility and manufacturability of a product can be further improved, andthe fireproof coating is more suitable for the use environment of the copper-clad aluminum busbar.