The present invention discloses a redundancy backup method suitable for a wide-area distributed real-time database. In a wide-area system, one or more copies are established in a distributed real-time database system for data in the system in a redundant manner, and consistency of the system is ensured by management of the copies. The method comprises the following steps: (1) the copies are divided into a cold copy and a thermal copy, wherein the thermal copy provides an external access, and the cold copy is only used as a backup copy providing no external service capability, and a thermal copy as a benchmark in all thermal copies becomes a master copy, and only the master copy is allowed to be written; (2) managing a status of the copy, wherein the copy is managed by means of status conversion the copy such as master/standby data switching and cold/thermal copy switching, so as to ensure consistency of data of the system; and (3) performing secondary positioning on a request that the master copy cannot achieve. According to the redundancy backup method suitable for a wide-area distributed real-time database provided by the present invention, a redundancy mechanism between different servers and different systems in the system is implemented; and consistency of the data in the wide-area distributed system is ensured by management of the copies.