The invention relates to a localization migration method of power enterprise information system middleware and database. The method comprises the following steps: S1, putting localized middleware on line, connecting the localized middleware with a non-localized database, distributing a part of user service requests to the localized middleware, and distributing other user service requests to non-localized middleware; S2, after the localized middleware runs stably for a certain time, putting a localized database on line, and synchronizing data in the non-localized database to the localized database through a DMHS (Dual Module Hot Spare) tool; S3, connecting the localized database with the localized middleware, and keeping the non-localized database in a standby state, wherein at the moment, all user service requests are distributed to the localized middleware, and the non-localized middleware is in the standby state; and S4, after the localized middleware and the localized database run stably for a certain time, gradually removing the non-localized middleware and the non-localized database.