The utility model provides a vacuum air-discharge device for solving the problems, and the vacuum air-discharge device comprises a vacuum port arranged at the top part of a vessel shell body, a feeding hole, a spraying head connected with the feeding hole and used for spraying the liquid which is flown into the vessel shell body from the feeding hole on the inner wall, and a discharge hole arranged at the bottom part of the vessel shell body; and a cooling jacket is arranged on the outer wall of the vessel shell body. The vacuum air-discharge device can effectively remove the bubbles in the liquid; the structure is simple; the implementation is easy, and the packing precision is improved.