The invention discloses a high-voltage cable deicing device, which comprises a power device, a travel device (1), an ice-breaking device (2) and a speed changer (4), wherein the ice-breaking device (2) comprises a knife handle (21) and a plurality of tools (22) arranged on the knife handle (21); the knife handle (21) is of a cylinder structure and is arranged on the travel device (1) through a bearing (3); the knife handle (21) is fixedly connected with an inner ring of the bearing (3); an outer ring of the bearing (3) is fixedly connected with the travel device (1); and an output shaft of the speed changer (4) is connected with the knife handle (21) through a transport component (5). Compared with the prior art, the high-voltage cable deicing device has the advantages that the force application direction is changed, the high-voltage cable deicing device plays screwing and twisting roles by applying force to the tangential direction of a cable, and is more labor-saving than pushing forward for ice cutting, and power resources are saved.