The controllable source audio magnetotelluric method can effectively overcome the shielding effect of high-resistance caprock and is sensitive to the reaction of deep geological bodies. This method was successfully applied in the exploration of coalfields. According to the electrical characteristics of low-resistivity of the Jurassic Lower Garden Group, the structure and fault structure of the high and low resistance strata in the working area were determined. The sedimentary laws of the coal-bearing rock series were summarized and the coal-bearing zone was delineated. After drilling construction, the location of the coal seam was consistent with the inferred conclusions of geophysical exploration, which successfully guided the coal-seeking work and accumulated experience for further geological exploration of the coalfield.