The continuous quenching and tempering furnace for steel strip mainly includes unwinder, quenching furnace, quenching oil tank, tempering furnace, cooling water tank and coiler. Quenching and tempering treatment includes double heat treatment of quenching and high temperature tempering. Its purpose is to make the workpiece have better comprehensive mechanical properties of strength and plasticity. Under the tension control of the coiler, the steel strip is discharged by the unwinder, enters the furnace from the seal of the quenching furnace, and is heated in the protective atmosphere, then quenched through the oil tank, and then tempered sorbite structure is obtained after high temperature tempering and cooling.