Large-tonnage stay cable fatigue testing machine

The utility model relates to the technical field of instruments and meters, in particular to a large-tonnage stay cable fatigue testing machine which comprises a horizontal stress frame, the horizontal stress frame is composed of a cross beam, a front cross beam, a side beam and a rear cross beam, the side beam is fixedly installed on the inner side face of the cross beam, and the rear cross beam is fixedly installed on the other end face of the side beam. The side beams are connected with the front beam through guide devices, the beam is located in the middle between the front beam and the rear beam, the guide beam is fixedly installed at the end, away from the rear beam, of the beam, the connecting beam makes contact with the guide beam, and guide wheels are arranged on the lower end face of the front beam. According to the utility model, the front cross beam is combined by the guide beams, the middle cross beam, the linear slide rails and the guide wheels to limit the up-down and left-right freedom degrees