Vacuum negative pressure grouting method and device

The invention discloses a vacuum negative pressure grouting method and device, and belongs to the technical field of geotechnical engineering construction. A working body which is capable of passing the vacuum negative pressure in the full length range and grouting slurry is parallelly inserted into a foundation according to the designed spacing and depth, and the system is isolated from the outside air; vacuumizing is conducted on a part of the working body, and the slurry is grouted from the other part of the working body; the slurry can be evenly grouted into the foundation according to the designed space in the breadth and depth range of inserting of the working body due to attraction of the vacuum negative pressure, thus the intensity of a soil body is improved, and the permeability is lowered; and the vacuum negative pressure grouting method and device can be used for manufacturing underground water stop curtains, and improving the foundation bearing capacity and anti-permeability of newly-built buildin