The invention discloses a cable deicing device, which comprises a substrate and an ice crushing device, wherein four travelling gears are arranged at the upper part of the substrate; a first motor isarranged on the substrate; a first gear and a second gear are fixedly arranged on a driving shaft of the first motor; a third gear is fixedly arranged on a first rotating shaft; a fourth gear is fixedly arranged on a second rotating shaft; the first gear is connected with the third gear through a first belt; the second gear is connected with the fourth gear through a second belt; the ice crushingdevice comprises a second motor and two deicing gears; the two deicing gears are arranged at the left parts of two travelling gears at the left side separately and are arranged at the upper part of the substrate through a second support plate; a fifth gear is fixedly arranged on a third rotating shaft; a sixth gear is fixedly arranged on the driving shaft of the second motor; and the fifth gear ismeshed with the sixth gear. According to the cable deicing device, deicing work on side-by-side cables is achieved, the problem that ice on the cables cannot be treated is solved and normal use of the cables is ensured.