The present invention relates to an automatic defrosting and de-icing device of a cable. The device comprises a travelling device, a rotation device, an air tube, an air injection block, a power supply device, a wireless remote transmission module, a control device, conveyer belts, a cable hole and the like. The front end of the travelling device is provided with a rotation device, the cable holeis arranged between the travelling device and the rotation device, the rotation device is connected with the air injection block through a bracing piece, the air tube is arranged between the rotationdevice and the air injection block, the travelling device is internally provided with the power supply device, the wireless remote transmission module, the control device and the conveyer belts. The automatic defrosting and de-icing device of a cable is simple in structure and convenient to operate, can perform walk by itself on the cable, the surface of the cable is subjected to defrosting and de-icing through hot wind, the skin of the cable is not damaged, and the automatic defrosting and de-icing device can be remotely operated by employing a mobile phone.