In order to solve the problems of complex operation, long time-consuming and low measurement accuracy of traditional manual calibration method in the calibration process of large-range displacement sensors, an automatic calibration device for large-range displacement sensors was developed. The hardware composition and software design of the device are introduced in detail, and its innovative features are expounded. The device is used to calibrate LVDT displacement sensor and evaluate its measurement uncertainty. Experiments show that the displacement sensor calibration device has high measurement accuracy and good operation stability, can effectively improve the verification efficiency, can replace manual automatic verification of displacement sensors, and has important technical reference significance.