The invention discloses a mechanical performance test system for an isolating switch. The mechanical performance test system comprises a test box for holding the isolating switch and a control platform. A driving mechanism for driving the isolating switch for switching-on/off tests is arranged in the test box, and is provided a monitoring component for acquiring the test information of the isolating switch. The monitoring component transmits the test information to the control platform, thereby continuously monitoring the working state of the isolating switch through the control platform and being able to accurately and timely determine the mechanical performance of the isolating switch. The control platform includes a display processing module. When the test system is abnormal, the display processing module can timely issue a control command and controls a power module to stop supplying power in order that a tester can eliminate a potential safety hazard. In addition, the temperaturein the high-low temperature test box can be set by a temperature relay in order that the test system tests the mechanical performance of the isolating switch under different temperature conditions.