The invention discloses a production line for steel wire coating. The production line comprises a paying out machine, a first tension dance device, a dust removal device, a steel wire heating device,a skin-foam-skin main machine, a movable warm water tank, a warm water tank, a fixed water tank, a cold water tank, an outer diameter measuring instrument, a leading machine, a second tension dance device and a take-up machine. The paying out machine, the first tension dance device, the dust removal device, the steel wire heating device, the skin-foam-skin main machine, the movable warm water tank, the warm water tank, the fixed water tank, the cold water tank, the outer diameter measuring instrument, the leading machine, the second tension dance device and the take-up machine are sequentiallyand transversely arranged side by side and are controlled by a main control electric box to work. Based on the cooperation of all the above mechanisms, the automatic production of coated steel wireson the whole production line is realized. The production benefit of enterprises is greatly improved. Particularly, by means of the dust removal device and the steel wire heating device, steel wires are subjected to dust removing, cleaning and heating respectively. By using an optical cable with a coated steel wire, the tensile strength of an optical fiber can be effectively enhanced, and the shrinkage of the optical cable is reduced. The optical fiber attenuation performance is stable, and the signal transmission performance is enhanced. The performance of an optical device is more stable, andthe overhead performance of the optical cable is effectively improved.