Abstract: A cable structure for underwater equipment is disclosed, which comprises a waterproof layer, a tension-resistant layer, a buoyant layer, and a communication thread. The tension-resistant layer is enveloped in the waterproof layer. The buoyant layer is enveloped in the tension-resistant layer. The communication thread is enveloped in the buoyant layer. In use, the waterproof layer can protect the communication thread from contacting with water. The tension-resistant layer can enhance the tensile strength of the cable structure, so that the cable structure can be protected from damages upon being pulled. The buoyant layer can provide buoyancy for the cable structure, so that the cable structure can avoid excessive cable being submerged in the water, so that entwining or entangling of the submerged cable section can be prevented. Accordingly, the present invention is a useful contrivance that can avoid cable entanglement and has a tension-resistant capability.