Data synchronization method, system and device

An embodiment of the invention discloses a data synchronization method, system and device and relates to the communication field. The data synchronization method, system and device are used for avoiding data inconsistent during a data synchronization process. According to the data synchronization method, system and device, when data updating operations are monitored through a sending device, files with set types containing updating operation information of all database tables are generated after all the database tables involving in the data updating operations are successfully updated, the generated files are sent to a receiving device, the receiving device performs updating operations on the database tables according to the updating operation information in the files after receiving the files with set types, and data roll-back namely repealing the updating operations on all the database tables is performed if abnormal conditions happen to the data updating. The data synchronization method, system and device can avoid data inconsistent during the data synchronization process.