Torsional rigidity testing device

The utility model provides a torsional rigidity testing device which is used for improving the situation that the torsional rigidity testing device is complex in structure. According to the embodiment of the utility model, in the torsional rigidity testing device, the tool is used for loading the piece to be tested, and under the loading condition, the first end of the piece to be tested is fixed, and the second end of the piece to be tested is allowed to perform torsional vibration; the excitation device is mounted on the tool; the balancing weight is adjustably installed on the tool and used for adjusting rotational inertia. And the measuring module is used for being coupled with a measured piece or a tool. The vibration excitation device applies vibration excitation to the tool, so that the second end of the measured piece generates torsional vibration under the condition that the balancing weight is installed, and the measurement module obtains the inherent frequency under the torsional vibration. Accordi