Method and device for monitoring seepage of underground diaphragm wall of foundation ditch of building

The invention relates to a method and device for monitoring the seepage of an underground diaphragm wall of a foundation ditch of a building. The method comprises the following steps of: (1) constructing a borehole at the center of the foundation ditch, arranging a power supply electrode A at the bottom of the borehole, and arranging another power supply electrode B at a place 7-10 times of the length of the foundation ditch away from the center of the foundation ditch; (2) arranging detection points on the ground surface along the underground diaphragm wall in a manner of surrounding the foundation ditch, and arranging a measuring electrode M and a measuring electrode N at each detection point along the direction vertical to the underground diaphragm wall; (3) marking out planar positions with abnormal delta VMN; (4) marking out vertical elevations with the abnormal delta VMN; and (5) obtaining positions corresponding to the planar positions with the abnormal delta VMN obtained in the step (3) and the vertical elevations with the abnormal delta VMN obtained in the step (4), thereby obtaining positions in seepage. The invention further relates to a device for monitoring the seepage of the underground diaphragm wall of the foundation ditch of the building. By using the method and device for monitoring the underground diaphragm wall of the foundation ditch of the building, the damage to an underground diaphragm wall body can be avoided, and the operation is very simple and convenient.