The invention discloses a virtual power grid-based medium- and long-term dynamic simulation safety strategy modeling method, and relates to the technical field of safe and stable analysis and estimation of a power system. According to the virtual power grid-based medium- and long-term dynamic simulation safety strategy modeling method, by building a virtual power grid comprising virtual electricalcomponents such as a virtual circuit, a virtual load and a virtual power generator, bridge connection of fault judgment condition and measure control signal in an automatic safety device model and astable control strategy model of a PSD-FDS program is achieved, the combined calling of the automatic safety device model and the stable control strategy model is further completed, and modeling and verification of a multi-criteria safe and stable strategy of the complicated power grid are achieved.