The invention discloses a cloud distributed real-time database system which comprises a real-time database and a real-time service bus. The real-time database comprises a storage layer with a distributed hierarchical structure, a positioning layer and an interface layer; the storage layer stores a real-time model based on a distributed NoSQL database, and the real-time model corresponds to a relational model of a relational database of the power grid system; the positioning layer is used for storing fragmented memory snapshots, and the fragmented memory snapshots comprise monitoring model snapshots, numerical section snapshots, transaction snapshots and the like; the interface layer provides a transaction type component and is used for realizing establishment, access and processing of a fragmented memory snapshot; and the real-time service bus comprises a model loading service, a fat client service and the like. Based on the intelligent power grid regulation and control system CIM model grouping and slicing technology, fat client service real-time calculation processing and thin client quasi-real-time access are achieved, model checking and synchronization functions are expanded, and concurrent control and extension expansibility of the system are improved.