The invention discloses an electromagnetic excitation method for realizing time dilation through multi-excitation-source cascading. Small currents are taken as excitation currents of coils, through rapidly cutting off the currents, the current change rate is improved, amplitude of excitation currents is reduced, transient electromagnetic fields according with requirements are generated around the coils, through adoption of such a mode that the multiple coils are cascaded and are successively discharged, excitation time is prolonged, dilation of excitation time is realized, and the mode that the multiple coils are cascaded and are successively discharged is as follows: the multiple coils are completely charged and then are successively discharged, or the multiple coils complete successive cyclic discharging through charge and discharge switching of the coils in a charging process. According to the invention, an electromagnetic field excitation system taking the small currents as the excitation currents of the coils is enabled to realize effect dilation of single excitation time, and the realization method is simple, is easily implemented and can be conveniently controlled or adjusted.