This testing machine is suitable for TUV, VDE, UL and other high flexible cable testing requirements. The machine structure is a horizontal double-wing combination structure, which is mainly used to detect whether the cable has a short circuit after repeated high-speed U-bending tests driven by the energy chain, and whether the insulation sheath has cracks, breakages or other abnormal phenomena; In order to detect the performance and obvious defects of metal wire to withstand plastic deformation in repeated high-speed U-shaped bending tests.