The steel wire heat treatment production line consists of wire pay-off machine, heat treatment furnace, lead bath furnace and wire take-up machine. After being processed by this production line, the steel wire acquires an ultrafine lamellar sorbite structure. As the optimal microstructure for steel wire drawing, this structure ensures that the steel wire features high tensile strength together with excellent ductility during subsequent drawing processes. Therefore, the steel wire heat treatment production line is essential equipment for manufacturing high-performance steel wires.