The invention discloses a method and device for achieving non-stop routing of a routing protocol. The method includes the steps that when a main routing engine is normal, neighbor state information is backed up to a standby routing engine; when the main routing engine fails, the standby routing engine obtains the routing information of neighbor routers according to the back-up neighbor state information in the backup mode and generates local routes again, and the optical route is calculated and issued to all the neighbor routers and local hardware. The method and device can reduce resource consumption of the routers and improve operation efficiency of the routers.