The invention relates to a defroster, especially a defroster of a high-voltage cable. The defroster comprises two road wheels, heating rods (5), fixed plates (1), road wheel supports, and pulling ropes (11). The road wheel supports are arranged at the two sides between the two road wheels; and the pulling ropes are arranged at the middle parts of the two road wheel supports respectively. Each road wheel consists of a wheel plate A (2), a wheel plate B (7), and a wheel shaft (3); the two ends of the wheel shaft are connected into middle holes of the wheel plate A and the wheel plate B in a rotating mode; and the wheel shaft has a hollow structure and one heating rod is arranged in the hollow part of the wheel shaft. The fixed plates are fixed on the opposite inner sides of the wheel plate B and the wheel plate A respectively; and a plurality of blades (14) are arranged on the peripheral inner surfaces of the two corresponding fixed plates at intervals. The provided defroster with a simple structure can be used conveniently. Deicing can be carried out by controlling the defroster by one worker under a pole. Moreover, because the heating rods and the blades can carry out deicing simultaneously, the deicing is accelerated substantially and the working efficiency is effectively improved.