Optical line protection device and system

The invention discloses an optical line protection device, which is arranged between a client-side optical fiber and a transmission protected side optical fiber of an optical line. The optical line protection device comprises an optical receiving module 101, an electric crossbar switch 102, an optical transceiver module 103 and an optical transceiver module 104. The optical receiving module 101 is connected with the client-side optical fiber; the optical transceiver module 103 and the optical transceiver module 104 are communicated with a main channel and a backup channel of the transmission protected side optical fiber; and the electric crossbar switch 102 is arranged between the optical receiving module 101 and the optical transceiver module 103 and the optical transceiver module 104 and is used for communicating the optical receiving module 101 with the optical transceiver module 103 or the optical transceiver module 104 according to the preset strategy. The invention also discloses an optical line protection system.