The invention relates to the technical field of cables, and further discloses an automatic cable deicing device based on the cam transmission principle. The device comprises a frame, the top of the frame is fixedly connected with a solar panel, and a main gear is movably connected in the frame. The outer portion of the main gear is connected with a connecting gear in an engaged manner, the outer portion of the connecting gear is fixedly connected with a convex block, and the outer portion of the convex block is movably connected with a driving lever. The outer portion of the driving lever is fixedly connected with a tension spring, the outer portion of the driving lever is fixedly connected with a concave hammer, and the inner portion of the frame is movably connected with a power wheel. Through the cooperative use of the main gear, the connecting gear, the convex block, the driving lever, the tension spring and the concave hammer, the effect of hammering the cable is achieved, and theice on the surface of the cable falls off, so that the cleanness of the surface of the cable is ensured, pole falling caused by the overweight of the cable is avoided, and the safety of a circuit iseffectively protected. Moreover, according to the automatic cable deicing device, the operation is simple, the energy effect is less, and the energy cost is effectively saved.