Drag chain is suitable for the nc machine tools, machining centers, automated machinery and production lines and other kinds of machine tools, robots, transport machinery, measuring instruments, handling device and other liquid drive control as a wire, cable, gas hose protection device, can take on machine tools, machinery and equipment moving parts run harmoniously, can play a safety protection and the ability to guide, can prolong protected wire, cable, liquid, gas hose service life and reduce consumption, can greatly improve the machine tools, machinery and equipment of wire, cable, liquid, gas hose to confirm the unorderly situation existing in distribution, make it tidy and rules is arranged together, can enhance the overall artistic effect of machine tools.