A pump valve vacuum degassing device including a receiving funnel, a loading member, a vacuum processing chamber, and a discharging member sequentially connected in a sealed manner and having internal cavities in mutual communication. The receiving funnel can achieve complete and thorough slag avoidance, and does not require any manual control operation. The vacuum processing chamber is provided with a barrier member configured to increase a falling time duration of liquid steel and sufficiently spread the liquid steel, so as to create a more ideal and sufficient condition for removal of harmful gases. The U-shaped structure of the loading member and discharging member ensures maintenance of a vacuum environment during off-time of the device and retaining of airtightness, such that air ingress diminishing a vacuum condition no longer occurs. The device can realize continuous manufacturing in a vacuum.