The invention discloses an electric power system two-stage stochastic optimization scheduling model considering flexible load. The electric power system two-stage stochastic optimization scheduling model considering flexible load is characterized by giving a response to wind power nondeterminacy through the mode that the flexible load provides standby application; and for fully developing the up-regulation and down-regulation potential, providing a concept of using the flexible load up-regulates/down/regulates the standby capacity, wherein up-regulation of standby stands for reduction of demand, and down-regulation of standby stands for increase of demand. The electric power system two-stage stochastic optimization scheduling model includes a day-ahead stage and a real-time stage based onscenes, wherein the day-ahead stage determines start/stop of a set, a set, standby capacity of the flexible load, and wind power output. In the real-time stage, according to the wind power scene, thepractically scheduled set and the flexible load standby can be determined, and the load is interrupted, and the wind abandoning quantity is determined. The electric power system two-stage stochastic optimization scheduling model considering flexible load takes the flexible load as a schedulable resource, can give play to initiative and flexibility of the load through load tracking generation, andcan effectively supplement and improve the common electric power system scheduling.