A protection protocol device for network nodes comprising: a protection switching protocol unit to perform protection protocol calculation; a fault information detection unit to detect alarm information generated on both sides of network element nodes; a protection signaling detection unit to detect a first protection signaling generated on both sides of the network element nodes; a protection signaling transmission unit to transmit protection signaling to other network element nodes; a crossing configuration unit to perform service crossing configuration according to state information of a local network element node; and a protection signaling pre-transmission processing unit which respectively connects with said protection signaling detection unit and said protection signaling transmission unit, wherein said protection signaling pre-transmission processing unit is used to perform a pre-transmission judgment for the first protection signaling received by said protection signaling detection unit, and said protection signaling transmission unit forwards said first protection signaling which needs to be pre-transmitted to other network element nodes; characterized in that said first protection signaling which needs to be pre-transmitted is required to meet all the following conditions in meaning time: the first protection signaling being a valid signaling; a long/short path identifier indicated in the first protection signaling showing that the path is a long path; a source node identifier or a destination node identifier indicated in the first protection signaling showing that the source node or the destination node is not the local network element node; a bridging switching request indicated in the first protection signaling being a valid bridging switching request; a priority of the bridging switching request indicated in the first protection signaling being higher than that of the bridging switching request indicated in the first protection signaling transmitted by the local network element node in forwarding process. a protection switching protocol unit to perform protection protocol calculation; a fault information detection unit to detect alarm information generated on both sides of network element nodes; a protection signaling detection unit to detect a first protection signaling generated on both sides of the network element nodes; a protection signaling transmission unit to transmit protection signaling to other network element nodes; a crossing configuration unit to perform service crossing configuration according to state information of a local network element node; and a protection signaling pre-transmission processing unit which respectively connects with said protection signaling detection unit and said protection signaling transmission unit, wherein said protection signaling pre-transmission processing unit is used to perform a pre-transmission judgment for the first protection signaling received by said protection signaling detection unit, and said protection signaling transmission unit forwards said first protection signaling which needs to be pre-transmitted to other network element nodes; characterized in that said first protection signaling which needs to be pre-transmitted is required to meet all the following conditions in meaning time: the first protection signaling being a valid signaling; a long/short path identifier indicated in the first protection signaling showing that the path is a long path; a source node identifier or a destination node identifier indicated in the first protection signaling showing that the source node or the destination node is not the local network element node; a bridging switching request indicated in the first protection signaling being a valid bridging switching request; a priority of the bridging switching request indicated in the first protection signaling being higher than that of the bridging switching request indicated in the first protection signaling transmitted by the local network element node in forwarding process. the first protection signaling being a valid signaling; a long/short path identifier indicated in the first protection signaling showing that the path is a long path; a source node identifier or a destination node identifier indicated in the first protection signaling showing that the source node or the destination node is not the local network element node; a bridging switching request indicated in the first protection signaling being a valid bridging switching request; a priority of the bridging switching request indicated in the first protection signaling being higher than that of the bridging switching request indicated in the first protection signaling transmitted by the local network element node in forwarding process.