In dynamic wireless induction power supply systems, electromagnetic safety assessment is central to the practical application of high-power dynamic inductive power supply systems. The paper firstly derives the current expression for the LCC-S compensation circuit during the coupling process of the dynamic system, and analyses the key factors affecting the magnetic field distribution and the reasons for the transient shocks during the current switching process of the receiving coil. Secondly, in order to reflect the dynamic actual magnetic field distribution, the fitted excitation function is used as the receiving coil current, and the dynamic system is simulated and analyzed by finite element simulation software at seven speeds. Finally, based on the correlation analysis between the sampling points and the measurement area within the magnetic field sampling area based on Pearson’s formula, key measurement points for assessing the electromagnetic field strength within a specified area of a dynamic inductive power supply system are proposed.