The invention discloses a method, a device and a system for achieving interdevice linear protection mechanism interworking. The method comprises: after a linear protection group of a master interworking end device enables a protection group pending state, receiving a G.8131 protocol version detection instruction, and by the master interworking end device, executing a G.8131 protocol version detection operation on a slave interworking end device; according to detection results, determining a G.8131 protocol version utilized by the slave interworking end device; and interacting with the slave interworking end device by utilizing a G.8131 protocol version consistent with the G.8131 protocol version utilized by the slave interworking end device. When the linear protection group of the master interworking end device is in the protection group pending state, the master interworking end device is fixed on a link selected by the linear protection group to perform service transmission, not to respond host link and standby link fault and recover messages of the linear protection group, not to respond user operations defined by the G.8131 protocol, and not to transmit and receive APS protocol packets.