Robot joint torque calibration test device

The invention discloses a robot joint torque calibration test device which comprises a torque calibration sensor and a passive loading device which are arranged at the two ends of a robot joint; , andthe device further comprises a fixing device used for fixing the device and the robot joint. The passive loading device comprises an unloading shaft, a coupler, a lever speed reducer and a brake; anoutput shaft of the brake is connected with an input hole of the lever speed reducer; an output shaft of the lever speed reducer is connected with an input hole of the coupler; one end of the unloading shaft is connected with the robot joint, and the other end extends into the coupler. The input torque of the torque sensor and the input torque of the joint are directly equivalent, namely, the input torque is directly measured according to the ratio of 1: 1, fluctuation of load damping does not influence the measurement precision of the device, and therefore the higher measurement precision isachieved; the force increas