The invention provides a data synchronization method and device. The method comprises the following steps: detecting that a synchronization relationship between configuration data of a server of a cloud platform and configuration data of exchange equipment is damaged; receiving first configuration information issued by the server; and synchronously updating the configuration data of the switchingequipment according to the first configuration information. Through the method and the device, the problem that the service cannot normally use the corresponding relation when the corresponding relation between the configuration data of the server of the cloud platform and the configuration data of the switching equipment is destroyed in the related technology is solved.