The present invention discloses a system and method for realizing mobile management of fixed network switching node. The method comprises the following steps: setting a subscriber attribute register (SAR) in the fixed network, connecting the subscriber attribute register to each switching node via signaling link; distributing an unique logic number and physical number corresponding to the location for the subscriber, storing the subscriber attribute and location information of the switching node where the subscriber locates in the home SAR collectively, when the subscriber location changes, insetting the attribute data of the subscriber into the new location, deleting the data of the former location, and updating the location information of the subscriber in the SAR; when a call is activated, the calling office requests routing to the SAR, and SAR searching the called physical number and returning it to the calling office; when the subscriber attribute data changes, modifying the corresponding data in the SAR firstly, then insetting the data into the switching node where the subscriber locates, thus completing synchronous update of data. Through the present invention, the fixed network may have a function of a mobile network, and at the same time, the subscriber attribute data is managed collectively, thus make it easy to maintain and take full advantage of number resources.