The invention provides a route updating method and device. The method is applied to an edge device of an Ethernet passive optical network(EPON). The method comprises the following steps: obtaining a first port number; generating an update message; and sending the update message to a server according to first routing information to enable the server to update second routing information in the server according to the first port number. The edge device can send the update message carrying the first port number to the server to enable the server to update the corresponding second routing information according to the first port number, thereby preventing the case that the message sent by the server to the edge device cannot be processed normally by the edge device since the server fails to update the second routing information in time.