In order to solve the problem of water accumulation in the No. 4 coal goaf in the upper part of the 51203 mining face in Shengxin Mine, Inner Mongolia, which affected the mining safety, No. 4 coal in the upper part of the 51203 working face was mined with underground frequency electrical perspective technology. The water accumulation in the area was targeted for detection. Through the early geophysical design, field data collection in the mid-term working face, and indoor data processing and interpretation in the later period, the position and influence range of the water accumulation in the No. 4 coal goaf in the upper part of the work face were delineated. Based on the results of this geophysical survey, Shengxin Mine adopted targeted measures such as drilling and releasing water in advance to deal with the No. 4 coal seam goaf water accumulation area on the working face, which eliminated the safe mining of the working face due to water inrush from the roof goaf of the working face, with good result.