Abstract: Landslide is a common geological hazard. A three-dimensional underground displacement measurement sensor based on the double mutual inductance equivalent voltage method is designed. Due to the low interpolation accuracy and complex position calculation method of the dual mutual inductance voltage measurement model in solving spatial positions, the measurement accuracy is low. The improved Dual-Kriging interpolation method based on quantum pigeon inspired algorithm was adopted to improve the original interpolation accuracy. The experimental result shows that this method avoids the complex problem of Kriging interpolation and improves the calculation speed. At the same time, the overall accuracy has been significantly improved, reducing its fitting error and the actual value to a maximum of three ADC resolutions. Through the landslide experiment on the landslide simulation experiment platform, it is proved that the sensor can effectively reflect the displacement of the underground soil, and has important application value for the displacement monitoring of the slope.