The invention discloses a joint torque measuring system for injured finger rehabilitation, and relates to a joint torque measuring system. By the aid of the joint torque measuring system, the problems of general deficiency of sensing functions of existing rehabilitation manipulators and incapability of measuring the magnitude of interaction force between finger joints and external skeletons by the existing rehabilitation manipulators can be solved. The joint torque measuring system is characterized in that motor output-end cable wheels are mounted on output shafts of driving motors, D-shaped shafts are penetratingly arranged on joint cable wheels, two ends of each D-shaped shaft are mounted on cable wheel carriers via two bearings, joint angle sensors are fixedly arranged on the upper end surfaces of the cable wheel carriers via screws, magnetic steel clings onto the upper end surfaces of the D-shaped shafts, the magnetic steel and the joint angle sensors are arranged in a directly facing manner, joint seat end covers are fastened on the upper end surfaces of the cable wheel carriers, joint seats are fixedly arranged on the side walls of the cable wheel carriers, each cable wheel carrier is provided with two threading pipes which are parallel to each other, an elastic element is arranged on each threading pipe, and Bowden cables are wound on external joint unit cable wheels and the motor output-end cable wheels. The joint torque measuring system has the advantage that the joint torque measuring system can be used for injured finger rehabilitation.