Vacuum quenching device

The utility model discloses a vacuum quenching device, which comprises a base, wherein a quenching cylinder is arranged on the base; a quenching cavity is formed in the quenching cylinder; a material inlet/outlet is formed in the top of the quenching cavity; a sealing door is arranged on the material inlet/outlet; a water tank for storing a quenching medium is connected to the upper end of the quenching cavity; a connecting pipe is arranged between the water tank and the quenching cavity, and a valve plate is arranged in the connecting pipe; a vacuum pump set is connected to the quenching cavity, and used for extracting air in the quenching cavity; a material lifting device is arranged in the quenching cavity, and used for feeding and discharging of a material in the quenching cavity; a hot air pipe for drying in the quenching cavity is arranged in the quenching cavity. According to the vacuum quenching device, not only can the material be quenched in various manners, but also damage to the device can be reduced, so that the service life of the device can be prolonged.