Disclosed is a pulse load power equivalent method according to system dynamic characteristics. The power equivalent method aiming at a pulse load comprises determining a constant diesel generator set-rectifier-pulsed load, selecting different types of diesel generator sets according to the difference between power ratios of a diesel engine and a synchronous generator, and simulating a plurality of operation modes of a DSP system through adjustments of a trigger pulse of an IGBT of a rectifier-pulsed load end or changes of an equivalent resistance value of a load according to a continuous pulse non-linear load equivalent simulation method. According to influence rules of various related factors for the dynamic characteristics in the DRP system, input ends of a neural network model are provided with a machine set type, a filter capacitor, peak power, a switch period and a duty ratio, and output ends are provided with a voltage fluctuation, a frequency fluctuation and the voltage total harmonic distortion rate.