The cable clamp structure of a welding robot is provided with a clamp which is comprised of a spring to fix a welding cable and a manipulation line, and if the cable and manipulation line are operated by the welding robot, is engaged with the cable and manipulation line. The cable clamp structure of the welding robot comprises: a spring having an outer ring attached on the end thereof and an inner ring coupled on the inner peripheral surface of the outer ring; and a clamp coupled on the top surface of the inner ring and having a receiving portion thereof.
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