Negative pressure device

The utility model discloses a negative pressure device, and relates to the technical field of negative pressure devices.The negative pressure device comprises a box body, a box cover is arranged at the top end of the box body, a plurality of sealing rings are fixedly mounted at the top end of the box cover, extraction columns are rotatably mounted in the sealing rings, and first worm wheels are fixedly mounted at the side ends of the extraction columns; a first worm gear is fixedly installed on one side of the box cover and rotationally connected with the box cover, a first worm is rotationally installed in the box cover and meshed with the first worm gear, a second worm gear is fixedly installed on one side of the first worm and rotationally connected with the box cover, and a second worm is rotationally installed in the box cover and meshed with the second worm gear. The second worm is meshed with the second worm wheel, a frame body is arranged in the box body, and a leakage pipe is arranged on the position