Volatile organic contaminated soil underground water multi-term extraction system and volatile organic contaminated soil underground water multi-term extraction method

The invention relates to a volatile organic contaminated soil underground water multi-term extraction system and method, and belongs to the technical field of underground water in-situ remediation. The volatile organic contaminated soil and underground water multi-term extraction system comprises a vertically arranged bridge type well casing, a liquid phase extraction device, a gas phase extraction device and a purification device, one end of the liquid phase extraction device and one end of the gas phase extraction device are communicated with the interior of the bridge type well casing, and the other end of the liquid phase extraction device and the other end of the gas phase extraction device are communicated with the purification device; the liquid phase extraction device comprises an air compressor, an air distribution box communicated with the output end of the air compressor, a control cabinet with one end communicated with the air distribution box, a pneumatic pipeline communicated with the other end