The invention discloses an ice and snow removing device of a power transmission line. The ice and snow removing device is arranged on an overhead line, wherein a box body of the ice and snow removing device is internally provided with a scrapping plate, a hairbrush assembly, a heating belt sleeving the external part of the overhead line, an upper ice removing wheel and a lower ice removing wheel. Under the driving of a driving mechanism, the ice and snow removing device moves on the overhead line through a pulley set. Gears of the upper ice removing wheel and the lower ice removing wheel form certain extrusion forces to coating ice, and circumferential ice removing sharp teeth remove the coating ice on the power transmission line, so that rapid ice removing is realized; in addition, the heating belt is used to heat the external part of the overhead line, so that ice removing is convenient. The scrapping plate and the hairbrush assembly are capable of clearing scattered ice and accumulated snow on the overhead line, and in this way, the ice and snow removing device can effectively removing the coating ice and the accumulated snow on the overhead line, reduce the pressure caused by the e coating ice and the accumulated snow and ensure the normal power supplying in an icy and snowing day.