The invention relates to the technical field of electric power, and discloses a cable deicing device, which comprises a rotating sleeve, wherein a deicing mechanism used for deicing is arranged in the rotating sleeve, a rotating mechanism used for rotating is arranged on the rotating sleeve, the deicing mechanism comprises a deicing sleeve, fixing sleeves, a scraper and an elastic piece, the deicing sleeve is sleeved in the rotating sleeve, the rotating sleeve and the deicing sleeve are coaxially arranged, the fixing sleeves are fixedly installed on the outer wall of the deicing sleeve, transverse grooves are formed in the side walls of the fixing sleeves, the fixing sleeves are evenly distributed on the outer wall of the deicing sleeve, and the transverse grooves penetrate through the two sides of the fixing sleeves. According to the invention, the purpose of deicing is achieved through the deicing mechanism so as to effectively fall off a just-formed ice layer, then the deicing device rotates in a reciprocating mode through the rotating mechanism so as to achieve the purpose of deicing back and forth, and the blades are effectively prevented from being frozen.