The utility model discloses a many response backfire -proof device. The device includes induction power supply, induction coil and infrared temperature probe the induction coil in the equipartition have a plurality of porcelain tubes. The porcelain tube that the steel wire passes through in the induction coil can heat, utilizes the temperature of infrared temperature probe monitoring steel wire. The utility model discloses but many steel wires of coproduction, and the steel wire specifications range of production is 2 - 6mm, the problem of current oil hardening tempering production line lead bath heating tempering severe contamination environment, production specification less (2 - 6mm) is solved. Reach and avoid environmental pollution, reduction in production cost, cleaner production, energy saving and consumption reduction, improve production efficiency, enlarge the mesh of production range.