Epoxy resin-coated steel bar is a kind of steel bar with a layer of epoxy resin film protection on the surface of ordinary steel bar. The thickness of the coating is generally 0.15mm-0.30mm. The general surface of the coating is made of epoxy resin powder by electrostatic spraying method: the surface of the ordinary steel bar is derusted and roughened and heated to a high temperature of more than 230 degrees Celsius, and then the charged epoxy resin powder is sprayed onto the surface of the steel bar. The powder particles are charged, they are adsorbed on the surface of the steel bar, and are melted and combined with it. After a certain curing, a complete, continuous, epoxy resin film protective layer covering the entire steel bar surface is formed. The epoxy resin coating does not react with acids, alkalis, etc., has extremely high chemical stability and ductility, shrinks dry, and has excellent adhesion to the metal surface. It forms a barrier to moisture on the surface of the steel bar. , Oxygen, chloride or corrosive medium contact physical barrier, at the same time, because it has the function of blocking the steel bar contact with the external current, it is considered to be a chemical ion barrier.