The invention belongs to the technical field of power transmission equipment, and particularly discloses a power transmission and disaster-prevention off-line pole protection device. The device comprises an upper sealing cover, a lower shell and an off-line device, wherein the lower shell is fixedly connected with the upper sealing cover, the lower shell comprises an adjustment groove rail and a spring sleeve, wherein a threaded hole is formed in a bottom surface of a lower end of the lower shell, the off-line device comprises an adjustment device, a spring device and a line bearing device, the adjustment device comprises an adjustment bolt and a baffle block, the baffle block penetrates through the adjustment groove rail by a fastening piece and is fixed in the lower shell, the adjustmentbolt penetrates through the threaded hole and is close to a bottom end of the baffle block, the baffle block upwards and downwards slides along the adjustment groove rail when the fastening piece isloosen, the spring device comprises a spring press block and a spring, the spring is arranged in the spring sleeve, the spring press block comprises a second pin shaft and a spring pull rod, the linebearing device comprises a line bearing table and a high-voltage power transmission line, and the line bearing table is rotatably connected with the second pin shaft. The device has the advantages ofgood off-line protection effect and structural reliability.