The invention relates to the technical field of leakage preventing detection of foundation pit engineering enclosure structures, in particular to a method for detecting leakage of a foundation pit enclosure structure based on a micro-logging electrical method. The method comprises the following steps that S1, PVC electrode tubes having the corresponding lengths are made according to a steel reinforcement cage; S2, before the steel reinforcement cage is hoisted, at least one PVC electrode tube is bundled on steel bars in the length direction of the steel reinforcement cage, and the steel reinforcement cage is hoisted and is filled with concrete; S3, after the concrete is dried, a direct-current intensification-polarization instrument is adopted to polarize an electrode on each electrode tube or electrodes on different electrode tubes pair by pair from top to bottom so as to obtain the electrical resistivity of the electrodes pair by pair; S4, the leakage situations at the joints of continuous walls are judged according to the electrical resistivity. The simplified micro-logging electrical method based enclosure structure detecting method is established based on a traditional micro-logging method and a high-density electrical method, and quick, effective and accurate leakage detection is conducted on the joints of continuous walls or pile bodies.