Method for detecting hidden leakage point on waterproof curtain of foundation pit

The invention discloses a method for detecting a hidden leakage point on a waterproof curtain of a foundation pit. The method comprises the following steps of: forming a detection point at a position which is a fixed distance away from the waterproof curtain outside the foundation pit along a direction parallel to the waterproof curtain; detecting the soil layer electric resistivity at the detection point before internal precipitation of the foundation pit; detecting the soil layer electric resistivity at the detection point after internal precipitation of the foundation pit; and if the soil layer electric resistivity changes suddenly before and after, determining that the detection point is the position of the hidden leakage point. The detection method is simple and convenient, and leakage points can be detected accurately.