Quenching device

The utility model belongs to the technical field of trenchless heat treatment, and discloses a quenching device which comprises a supporting device, an external spraying quenching device, an internal spraying quenching device and an external spraying water replenishing device. Wherein the external spraying quenching device is used for spraying the outer surface of the drill rod; the inner spraying quenching device comprises an inner spraying nozzle used for spraying water into the drill rod. The outer spraying water supplementing device comprises a first water supplementing nozzle and a second water supplementing nozzle, a water outlet of the first water supplementing nozzle faces the outer ring face of one end of the drill rod, a water outlet of the second water supplementing nozzle faces the outer ring face of the other end of the drill rod, and the first water supplementing nozzle and the second water supplementing nozzle are used for spraying water to the outer ring faces of the two ends of the drill rod