The invention discloses a dynamic parameter aggregation method and system for a generator speed regulator. The method comprises the steps of calculating the spinning reserve capacity and active powerregulation performance index of each generator i in a generator set to be aggregated; classifying the generators in the generator set according to the type of the speed regulator; summing the active power regulation performance indexes adopting the same type of speed regulators to obtain the regulation performance indexes of different types of speed regulators, and calculating the average regulation performance index of each type of speed regulators; determining the type of a speed regulator of an equivalent generator; and dynamically aggregating speed regulator parameters of generators adopting the type of speed regulator. The invention provides a model selection and parameter aggregation method of a generator speed regulator in the power grid equivalence process by aiming at keeping theactive spinning reserve capacity and the overall regulation characteristic of a unit before and after the equivalence unchanged, the dynamic aggregation is high in calculation speed, and the engineering accuracy is high.