The invention provides an insulator vibration fatigue performance test device. The test device comprises a control device, a supporting mechanism, a driving device, a detection device, a first connecting mechanism and a second connecting mechanism. The driving device is used for applying changing axial vibration force to an insulator string to be tested. The detection device is connected with the driving device and used for detecting the axial vibration force applied by the driving device. The control device is electrically connected with the detection device and the driving device and used for receiving the axial vibration force and controlling the driving device to adjust the axial vibration force when the changing trend of the axial vibration force is inconsistent with the present changing trend. According to the test device, the insulator vibration situation under various conditions can be simulated so that the influence of the vibration fatigue state on the mechanical property of the insulator can be tested. Meanwhile, the vibration fatigue performance of the low-weight insulator can also be detected so that the test device has wide universality and provides technical support for the long-term engineering application of the insulator.