The invention relates to a system and method for managing a residential gateway by using a smart terminal. The system comprises a smart terminal and a residential gateway, wherein the smart terminal and the residential gateway are in communicated through a gateway App (Application) communication protocol; the smart terminal comprises a residential gateway management module, log files, mapping files and a smart terminal native database, wherein the residential gateway management module is used for looking up log files, accessing and modifying data in the smart terminal native database and adding aliases to MAC (Media Access Control) addresses in the mapping files; and the residential gateway comprises a background service module, a residential gateway native database and a residential gateway native software module, wherein the residential gateway management module accesses to the residential gateway native database, and the background service module is managed through the residential gateway native software module in a matching manner. According to the system and the method, parameters for setting the residential gateway can be queried, corresponding WiFi SSID (Wireless Fidelity Service Set Identifier) and / or password information of the residential gateway and the smart terminal are updated synchronously, and latest smart terminal App or residential gateway software is actively pushed to users, so that the upgrading operation is simplified.