Cross-service-area roaming processing method based on quantum secure local area network

The invention provides a cross-service-area roaming processing method based on a quantum secure local area network, which comprises the following steps that: a service gateway server inquires a gateway server to which a user terminal belongs according to an IP address attribution under the condition that the user terminal is judged to accord with a roaming state and the IP address attribution of the user terminal is changed; and allocating a quantum base station to the user terminal, notifying the user terminal to establish a communication connection with the allocated quantum base station, and disconnecting the connection with the original service gateway server and the original quantum base station, thereby completing roaming. Whether the user terminal is roamed can be accurately and timely judged, frequent ping-pong roaming in a boundary area is prevented, the IP address attribution of the user terminal is regularly detected, the burden of real-time detection on equipment and a system can be avoided, guara