The invention discloses a device and a method for repairing underground
water based on a
soil vapor extraction technology in the technical field of
environmental remediation, the device comprises a base, and a
gas supply device, a water liquid collection box, a gas purification device, a pump and a gas liquid separator which are arranged on the base, and an outlet of the
gas supply device is provided with an
exhaust pipe; an extraction
pipe is arranged at an inlet of the gas-liquid separator, an air hole is formed in the extraction
pipe, and a protective cover for covering the air hole is arranged on the extraction
pipe; the protective cover comprises a cover body, a top cover and a driving
assembly, and the sides, away from each other, of the cover body and the top cover are both conical. The problem that in the extraction pipe installation and
filter material backfilling process, a
filter material or fine-particle soil falls into the protective cover from the top opening, and then air holes of the extraction pipe are blocked is solved, it is ensured that the screen pipe section is kept smooth in the initial
system operation stage, and the extraction efficiency and repair reliability are remarkably improved.