Automatic switching device and method for optical fiber link of automatic switch of power system distribution network

The invention relates to an automatic switching device and method for an optical fiber link of an automatic switch of a power system distribution network. The device comprises a first optical switch and a second optical switch on receiving and transmitting pigtails of FTU, TTU and DTU site switches, the first optical switch is connected with a first switch, the second optical switch is connected with a third switch, and the second switch is arranged between the first optical switch and the second optical switch. According to the invention, the problems of manually going to the site for temporary fiber jumping and connecting optical fiber links of upper and lower stations are solved, operation and maintenance personnel do not need to go to the site for disconnecting the temporary fiber jumping, an automatic optical fiber link switching function of the distribution network automatic switch is realized, and the problem of endangering three-remote signal interruption of a plurality of FTUs, TTUs and DTUs is effec