The invention discloses a field torque calibration device. The field torque calibration device comprises a support, a supporting sleeve, bearings, a positioning shaft, a static correction beam, a balance disc and weights. The supporting sleeve used for installing the positioning shaft is arranged on the support, the positioning shaft and the bearings are installed in the supporting sleeve in a matched mode, one end of the positioning shaft is connected with a part to be measured, and the other end of the positioning shaft is fixedly connected with the static correction beam; the weights are hung at one end of the static correction beam, and the balance disc is installed at the other end of the static correction beam. According to the field torque calibration device, the two rows of rolling bearings are adopted as supporting of the positioning shaft, bending moment caused by self-weight of the weights is eliminated, friction moment of the supporting part is reduced, and the problem that pure torque loading can not be carried out on a large torque sensor is solved; the balance disc is installed at one end of the static correction beam, a circular arc structure is arranged at the other end of the static correction beam, and the problem that when the static correction beam is inclined, the length of a force arm is changed is solved; by adopting a thin steel strip to hang the weights, it is ensured that the action force arm of the gravity of the weights is located on the horizontal line all the time, system errors of the device are reduced, and the sensitivity of the device is improved.