The invention discloses an intelligent substation double-host history data synchronously-storing system and device. The intelligent substation double-host history data synchronously-storing system and device mainly solves the problem of improving the operation performance of an intelligent substation station control level automation system. The device comprises a main monitoring host, an auxiliary monitoring host, a main data server and an auxiliary data server. The main monitoring host and the auxiliary monitoring host are connected through network, and the main data server and the auxiliary data server synchronously store history data transmitted from the main monitoring host and the auxiliary monitoring host. The intelligent substation double-host history data synchronously-storing system also comprise a real-time library module, the real-time library module comprises an event data module, a standard interior data format module, a main data collecting and monitoring control system module and an auxiliary data collecting and monitoring control system module. Compared with the prior art, the intelligent substation double-host history data synchronously-storing system completes storing through the real-time library module, guarantees the accuracy of synchronous storing of the two hosts, enhances the capability of processing large amounts of history data, guarantees the reliability of synchronous history data storing of the two hosts and improves the operation performance of the intelligent substation station control level automation system.