Epoxy resin coated steel bar is a steel bar with a protective layer of epoxy resin film made on the surface of ordinary steel bar. The thickness of the coating is generally 0.15mm-0.30mm. The coating is generally made of epoxy resin powder by electrostatic spraying method: the surface of ordinary steel bar is heated to a high temperature of more than 230 degrees Celsius after derusting and roughening, and then the charged epoxy powder is sprayed on the surface of the steel bar. The powder particles are charged on the surface of the steel bar, and are melted and combined with it. After a certain curing and curing, a complete and continuous epoxy resin film protective layer covering the entire surface of the steel bar is formed. The epoxy resin coating does not react with acids, alkalis, etc., has extremely high chemical stability, large ductility, dry shrinkage, and excellent adhesion to the metal surface, forming a barrier on the surface of the steel bar from moisture , Oxygen, chloride or corrosive media contact physical barrier, at the same time, because of its function to block the steel bar from contact with the external current, it is considered as a chemical ion anti-corrosion barrier.