Hot dip galvanized cable tray is a cable support system made of cold-rolled steel plate as the substrate, which is coated with anti-corrosion coating by immersion in 600 ℃ high-temperature zinc solution. It is composed of modular components such as groove, tray, or stepped straight sections and bends. A 65-86 μ m zinc iron alloy layer is formed on its surface, which is achieved through a three-stage process of dissolution, mutual dissolution, and encapsulation. It has both electrochemical protection and physical barrier functions, and is suitable for rigid support of cables in strong corrosive environments.