The present disclosure discloses a method for migrating configuration information during live migration of a virtual machine. After receiving a message of live migration that a virtual machine migrates from a source physical host to a target physical host sent by a virtual machine management server, an identifier of a source forwarding switch of the virtual machine and an identifier of a target forwarding switch of the virtual machine are acquired. Prestored configuration information is sent to the target forwarding switch corresponding to the identifier of the target forwarding switch, so that the target forwarding switch stores the configuration information. A configuration information deletion instruction is sent to the source forwarding switch corresponding to the identifier of the source forwarding switch, so that the source forwarding switch deletes the prestored configuration information.