The invention provides a cable supporting device comprising a channel-steel vertical rod, a support pedestal, and a cable lifting device. The support pedestal consists of a base plate and a plugging block arranged on the edge of the base plate; and a channel-steel groove matching the appearance of the channel-steel vertical rod is formed in the plugging block. The bottom of the channel-steel vertical rod is plugged in the channel-steel groove; at least one horizontal support rod is arranged at the back of the channel-steel vertical rod; a plurality of separation boards sleeve the horizontal support rod; and an auxiliary fixing device is arranged at the middle of the horizontal support rod. The cable lifting device is arranged at the top of the channel-steel vertical rod. The cable supporting device having a simple structure can be used conveniently; because the device does not need to be fixed on the wall, the preparation work of cable laying is reduced substantially; and with the lifting device, the cable can be lifted easily and can be placed at a corresponding erecting height, so that the labor intensity of the worker is reduced.