The invention relates to the technology of electrical power system control, in particular to a plug and play system of smart power grids and an implementation method thereof. The plug and play system comprises a system management platform and a PnP object which are connected through a service bus and a message bus, wherein the system management platform comprises a PnP object register management center and a digital power grid model management center; and the PnP object comprises an intelligent substation PnP object, a smart power grids dispatching technology support system PnP object, and PnP equipment. According to the plug and play system, on the basis of an idea of 'universal plug and play', an automatic-identification and automatic-access mechanism or system framework of a 'smart device' is built on the field of smart power grids, so that a secondary control system and an information system can be gradually formed quickly and automatically, and plug and play and quick recombination of the smart power grids are realized on the basis of a smart power grids dispatching technology support system.