This article proposes a novel advanced detection method with excavation in coal mine roadway, which provides a feasible idea for the parallel operation of roadway excavation and advance detection. First, the scheme of advance detection with excavation is proposed, which uses the cutting head of the roadheader as the field source with excavation to integrate the geophysical prospecting method with the main body of the roadheader. Then, the theoretical model of advance detection with excavation is formulated to obtain the change law of the potential of the measuring point and compare it with the finite element calculation results. The accuracy and feasibility of the numerical calculation method of the measured point potential are evaluated. Finally, the diversion rules of the field source are determined, and the normal geological body is taken as a reference. The evolution law of the apparent resistivity of two different types of abnormal bodies, low resistivity and high resistivity, are compared and studied. When the field source is close to the low resistance water-bearing zone, the reduction for the average value of apparent resistivity is from 5. 40% to 29. 80% . If it is close to the high resistance fault, the average value of apparent resistivity increases from 7. 12% to 35. 53% . The water tank simulation experiment is carried out, and the results show that the proposed advance detection method with excavation in coal mine roadway can detect the geological conditions in front of the excavation face in real time and continuously.