The invention relates to an extraction method and system for transient sample data of an electric power system. An obtained setting parameter of the electric power system is inputted into a simulationsystem model established in advance, an assessment model is generated; and the transient sample data of the electric power system in the assessment model can be extracted by utilizing a machine learning algorithm. The calculation program realizes automatic batch input data card generation, modification and calculation in transient stable data text files and simulation work is implemented throughautomatic calling of the program, workload of generating simulation data is alleviated, the using effect is good, and the work efficiency is obviously improved.