In order to accurately measure the mechanical properties and rapidly evaluate of the mechanical life of the concentric connector during the inserting and unplugging, a concentric connector testing system of mechanical properties is developed. The system is mainly composed of the motion simulating mechanical device, the sensor measurement and the motor control subsystem, which has fourchannel test capabilities. According to the connector test standard, the system performance index is analyzed, and a testing method combining linear motion and rotary motion is proposed to make the test conditions better fit the actual use of the connector. At the same time, an adaptive flexible fixture is designed to reduce the installation error. The kinematic model is established and analyzed with which the time sequence of the linear and rotational motion is determined under ultimate speed. Multiple connector samples are tested, and the mechanical properties and the service life of the connectors are evaluated. The experimental results show that the system can meet the testing requirements and achieve the desired performance.