The topcoat with shielding effect and excellent weather resistance was developed. The base resin is fluorocarbon resin and isocyanate resin, the pigment is rutile titanium dioxide, the shielding filler is graphene and mica powder, the additives are aging additives and anti-mold additives, etc. Finally, the topcoat is matched with a sealing varnish and anti-corrosion primer, and the salt spray and humidity resistance can reach 1 500 h, and the xenon lamp aging resistance can reach 2 000 h. At the same time, other properties of the matching coating were tested.