PROBLEM TO BE SOLVED: To provide a method for preventing re-contamination of a soil contamination control measure-taken section, which can prevent the re-contamination of a target section from being caused by inflow of groundwater into the target section from a peripheral section.SOLUTION: In a method for preventing re-contamination of a soil contamination control measure-taken section: a target section 1, to which soil contamination control measures are taken, is surrounded by an impervious wall 3; lowering of a groundwater level L1 within the target section 1 and the removal or purification of soil within the target section 1 are performed; and subsequently, the re-contamination in the target section 1 is prevented. The method for preventing the re-contamination of the soil contamination control measure-taken section includes a step of supplying a liquid 7 into the target section 1 and lifting the groundwater level L1 within the target section 1.
