The invention discloses a method and device for achieving the configuration synchronization of data communication equipment, and relates to the technical field of data communication equipment synchronization. The method comprises the steps: defining a configuration synchronization start command and a configuration synchronization end command in a transmission TNE module; receiving a configuration synchronization start command from a main controller, and adding a configuration aging identification to each configuration in a configuration tree of the transmission TNE module; updating the configuration tree when to-be-synchronized configuration data transmitted by the main controller is received; enabling the transmission TNE module to execute the transmission of a related aging deletion and difference adding command according to the configuration aging identification of each configuration in the current configuration tree after the configuration synchronization end command from the main controller is received, and transmitting all received configuration data to an application layer sequentially according to the dependence relation between the configurations. The method can carry out the configuration synchronization under the condition that the data is not consistent after each switching of the main controller, enables the upper and lower data to remain consistent, and guarantees the normal operation of a business.