Artificial geological remains such as small kiln shafts became an important uncertain factor in the process of coal mining. In order to find out the occurrence and water accumulation of small kiln shafts in the working face of No.2 coal seam in Wanjie Coal Mine, the ground transient electromagnetic method and direct current method combined with the comprehensive exploration technology of underground advanced geophysical exploration and drilling exploration were used to detect, and the scope of goaf damage area of small coal mines was accurately delineated. Through the underground drilling verification, the wellbore position was identified, which provided geological data for the safe mining of Wanjie Coal Industry.