Test device for testing bidirectional alternating bending of steel wires in high/low-temperature environments

The invention discloses a test device for testing bidirectional alternating bending of steel wires in high/low-temperature environments, and belongs to the technical field of steel wire bending fatigue testing. The test device comprises an axial fatigue tester, a high/low-temperature environmental test chamber and a bending device, wherein the high/low-temperature environmental test chamber is used for providing temperature environments for testing; the bending device comprises a test platform deck and a pressure head; the pressure head is used for applying a load; a changeable fixed device ismounted at the middle part of the pressure head; the fixed device is capable of applying a load on a steel wire sample so as to pull the steel wire to respectively generate bending deformations upwardly and downwardly; the steel wire sample is horizontally fixed; and two ends of the steel wire sample extend into two support platforms on the test platform deck. According to the device, the axial tensile and compression lo