Abstract: In order to eliminate the influence of roadway on underground 3D electric method advanced detection technology, ANSYS finite element software was used to simulate the actual working situation of 3D electric advance detection in underground. Based on the control variable method, four models were established for comparison, and meshing, loading and solving of the established models were carried out. From the perspective of the potential change of the isosurface, it is obtained that the apparent resistivity is affected by the roadway, and then the false anomaly phenomenon that first decreases and then increases. The interference formula to eliminate the influence of the roadway obtained by the comparison method is used for correction, and the corrected result is consistent with the result when there is no roadway interference. Finally, the data in the engineering application was corrected, and the least-squares inversion based on the inequality constraint and the round constraint was applied. The three-dimensional visualization process was used to obtain the three-dimensional resistivity data volume of the top and bottom layers of the coal mines. Combined with the work area data, the top sand sandstone and bottom grey ash rich water anomalies are delineated, which improves the accuracy of the mine 3D electric advanced detection technology.