Line fatigue damage detection device

The invention discloses a line fatigue damage detection device, which belongs to the technical field of cable detection equipment, and comprises a base, the base is provided with a first mounting seat and a second mounting seat, the first mounting seat and the second mounting seat are respectively provided with a through hole for a cable to pass through, and the first mounting seat is rotatably provided with a mounting ring. The mounting ring is provided with at least three symmetrically distributed movable probes, the axes of the movable probes point to the circle center of the mounting ring, and the movable probes and the mounting ring are arranged in a sliding mode. The movable probes are driven by the power part to rotate, one end of each movable probe abuts against the outer side of the cable, and the other end of each movable probe abuts against the metal conductive ring; one end of the cable and the binding post are connected with an external circuit, if the metal conductor is exposed due to damage of