High-corrosion-resistance continuous closed polyester color-coated sheet and preparation method thereof

The invention discloses a high-corrosion-resistance continuous closed polyester color-coated sheet and a preparation method thereof.The high-corrosion-resistance continuous closed polyester color-coated sheet comprises a base plate, and the front face and the back face of the base plate each comprise a plating layer, an anti-rust slow-release layer and a continuous closed coating from inside to outside in sequence; the continuous closed coating comprises a self-repairing layer on the inner side and a closed polyester paint layer on the outer side. By arranging the anti-rust slow-release layer and the self-repairing layer, part of anti-rust factors can be released to protect the base material when the substrate is corroded by water vapor, the invalid loss speed of the anti-rust factors can be slowed down, permeation of corrosive media can be effectively blocked in cooperation with the self-repairing layer and the closed polyester paint layer, filling micropores can be blocked in the later period of coating cur