A rapid quenching furnace is composed of a furnace body, a bogie, a rapid joint, a movable furnace door, a flue and a closed device, the furnace body is arranged on the bogie, the flue is arranged at the top of the furnace body, one side of the furnace body is provided with the movable door, a workpiece is arranged in the furnace body, the flue is composed of a main flue and a branch flue, and the branch flue is provided with the closed device.