Ground-air electromagnetic detection technology obtained the electromagnetic response data of the detection area by laying electrical sources on the ground and collecting signals by aerial drones, and analyzed its water abundance situation. The ground-air electromagnetic technology of  coal mine was successfully applied in the detection of old goaf water and water-bearing structure in Laomupo Mine, Guxian County, Shanxi Province, and the evaluation of grouting effect in Xipangjing area of Jizhong Energy Dongpang Mine. Compared with hydrogeological data, the feasibility and efficiency of the detection technology were verified, and the low-resistance abnormal area of the mine was identified in advance, which provided a technical basis for the prevention and control of coal mine water disaster.