The invention discloses a power plant granularity based power grid model version sharing method. The method includes steps of S1, screening out a data model of a primary device related to the power plant; S2, screening out power grid parameter information cited in the primary device; S3, performing extension on the data model and generating a power plant model; S4, checking the power plant model and returning to the S1 if the checking is unsuccessful; S5, generating a power plant border definition file; S6, generating a power plant model version file through combination of the power plant model file, a power plant wiring map file and the power plant border definition file; S7, introducing the power plant model version file and returning to S1 if border judgment is unsuccessful; S8, checking the power plant model in S7 and returning to S1 if the checking is unsuccessful; S9, storing the power plant model. By adopting the method provided by the invention, safety of an intelligent scheduling system in an information interaction process is ensured and model information exchange efficiency is improved.