The invention relates to an ice-breaking device for power lines, in particular to a rotating ice-breaking device for the power lines. The problems that an ice-breaking device for the power lines lacks at present is solved. The rotating ice-breaking device for the power lines comprises an upper roll shaft, an upper roll arranged on the upper roll shaft in a sleeving mode, a lower roll shaft, a lower roll arranged on the lower roll shaft in a sleeving mode, two first connecting strip plates, two second connecting strip plates and a power roll; one end of each first connecting strip plate is arranged at one end of the lower roll shaft in a sleeving mode, the other end of each first connecting strip plate is arranged at one end of the upper roll shaft in a sleeving mode, and the surface of the lower roll is provided with teeth; the power roll comprises a roller motor, an outer roll sleeve is fixed on an outer rotor of the roller motor in a surrounding mode, the outer surface of the outer roll sleeve is provided with teeth, one end of each second connecting strip plate is arranged at one end of the lower roll shaft in a sleeving mode, the other end of each second connecting strip plate is arranged at one end of a roller motor shaft, and according to the lengths of the second connecting strip plates, it is guaranteed that the outer roll sleeve fixed on the outer rotor of the roller motor is meshed with the lower roll teeth. The ice-breaking device for the power lines is easy, rapid and safe to operate and is an ideal ice-breaking device for the power lines.