Rapid and safe heterogeneous wireless network switching method

The invention discloses a rapid and safe heterogeneous wireless network switching method, mainly solving the problems that switching time delay is long and safety is low in the existing heterogeneous wireless switching technology. The implementation scheme thereof comprises: a mobile terminal determines a target network to be switched by virtue of a target network discovery and selection mechanism, then asks a home authentication server for a switching ticket and registers a target subnetwork care-of address to the current access router; when switching, under the help of a target authentication server, the mobile terminal carries out mutual authentication between the mobile terminal and a target network access point by utilizing the switching ticket; after the authentication is successful, the mobile terminal immediately receives data forwarded by a target router by utilizing a new care-of address obtained in the target network; and the mobile terminal registers the new care-of address to a home agent while ensuring data to be transmitted in real time. In the invention, time delays of the mobile terminal before switching and during switching can be short and the method provides safety precautions for all the switching signallings, thus improving safety of heterogeneous network switching.