The invention discloses an address refreshing method for a sub-loop virtual channel, which comprises the following steps of: when a sub-loop interconnection node collects an SF message carrying address refreshing information from a control VLAN of a sub-loop of the sub-loop interconnection node, refreshing a local address forwarding list according to the SF message and constructing an FLUSH message, searching the corresponding exit port in the local address forwarding list and forwarding the FLUSH message to the virtual channel of the sub-loop from the corresponding exit port; when other interconnection nodes on the virtual channel receive the FLUSH message, searching the corresponding exit port, forwarding the FLUSH message from the corresponding exit port and then updating the local address forwarding list according to the LFUSH message; and when non-interconnection nodes of the virtual channel of the sub-loop receive the FLUSH message, forwarding the FLUSH message in a multicast VLAN mode and updating the local address forwarding list according to the FLUSH message. When the method is used, the diffusion of the LFUSH message on the virtual channel can be greatly reduced and the addresses of all the nodes on the virtual channel avoid being refreshed.