A torque detecting system is adapted to detect a setting torque of a torque providing apparatus. A torque driving apparatus is mounted on a stationary base to exert a resisting force on the torque providing apparatus. The setting torque of the torque providing apparatus corresponds to the resisting force. The torque detecting system comprises an angle detecting module and an operation device. The angle detecting module is mounted on the torque driving apparatus and outputs a detecting voltage. The operation device obtains a torque value via table-searching based on the detecting voltage. The torque value corresponds to the setting torque of the torque providing apparatus. The torque detecting system performs the torque detection through a non-contact detecting technique, such that detecting accuracy would not be affected after long term use.