The invention discloses a drag chain link for a robot cable. The drag chain comprises two chain link plates mounted in parallel, and the two chain link plates can be connected with each other througha cover plate to form a containing cyclic structure for containing the cable. Each chain link plate comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part of each chain link plate are stacked and connected into a whole through the connected ends, buckles are arranged on the first connecting parts, and clamping holes are formed in the second connecting parts. The buckles and the clamping holes are used for being in matched connection with clamping holes and the buckles on chain link plates adjacently connected with the chain linkplates to form a drag chain capable of constantly extending. By ingeniously designing the structure of the drag chain link, the drag chain links connected with each other can be mounted convenientlyand fast; and the drag chain link is simple in structure and good in use flexibility, and a connecting mechanism between the drag chain links is stable and can adapt to the bending action of the dragchain in the use process.