Disclosed are a service access control method and a service access control system. The method comprises: a broadband network policy server transferring local access control list information to a home gateway; and the home gateway, according to the received local access control list information, performing access control on data of a mobile terminal. The system comprises: a broadband network policy server and a home gateway. The broadband network policy server is configured to transfer local access control list information to the home gateway. The home gateway is configured to perform access control on data of a mobile terminal according to the received local access control list information. The present invention can guarantee effective control of a fixed network over a service behavior of a mobile terminal.