The steel structure renovation supporting coating system consists of high solid supporting products developed to suit the renovation needs of steel structures, which involve high construction difficulty, short construction periods and poor rust removal quality. The products can form thick films at one time and thus save time and labor. In addition, low surface treatment technology is adopted for the primer of the products, ensuring high surface tolerance and allowing application with moisture and rust on. At the same time, the primer has excellent anti-corrosion and anti-rust performance, which can fully wet, penetrate and seal rusty objects and bond the rust layer into a closed coating layer. When the rust removal class reaches ST3 or SA2, the primer can achieve good anti-corrosion effect. The product system is made from epoxy mica iron intermediate paint with an excellent shielding effect and acrylic polyurethane topcoat or fluorocarbon topcoat with excellent weather resistance and color retention. Featuring excellent corrosion, rust and weather resistance and color retention performance, the product system is a reliable anti-corrosion product system with a proven track record in the market, with wide use in steel structure renovation and maintenance coating projects under all kinds of atmospheric environments, including bridges, petrochemical refineries, thermal power plants, wind power stations, steel mills, chemical plants and paper mills.