The invention discloses a high-order trajectory sensitivity calculation method taking discrete control into consideration. When high-order trajectory sensitivities of a system before and after the occurrence of a discrete event are calculated, the direct calculation of the high-order partial derivative of a state variable on control parameters is highly complex. Based on a mathematical electric power system model taking discrete control into consideration, the method calculates high-order trajectory sensitivities of system variables before and after the occurrence of a discrete event; and withthe high-order trajectory sensitivities as initial values, high-order trajectory sensitivities of the system variables at the moment of discrete control action are calculated until next discrete control action is carried out or simulation time is over. By calculating the influence of discrete control on system dynamics, the method meets and further perfects the requirement of electric power system safety analysis and control, and can more fully reflect the influence of certain control parameters or initial conditions on state response in the process of system dynamics.