The utility model provides an automatic calibration device for a wire drawing instrument, which comprises a central control unit, a servo motor transmission module, a grating measurement module, an upper computer connected with the central control unit, and a wire drawing instrument calibration table used for fixing the wire drawing instrument, and the wire drawing instrument is in communication connection with the upper computer. The central control unit sends an instruction under the control of a PC end upper computer; The servo motor transmission module drives the to-be-tested wire drawinginstrument to generate displacement, the grating measurement module measures the displacement in real time and feeds the displacement back to the central control unit, and the central control unit controls the starting and stopping of the servo motor according to a built-in algorithm, so that the automatic calibration of the wire drawing instrument is completed. According to the utility model, thecalibration process is completely automated, and the efficiency of the calibration process of the tension wire instrument can be greatly improved.