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Relative seismic measurement of landslides is the top priority in landslide monitoring and early warning. In order to solve the problems of difficulty in real-time continuous monitoring and unstable measurement accuracy, a relative seismic measurement method based on Beidou navigation and positioning data is adopted, and Kalman-assisted smoothing is applied. The noise during the measurement process ensures that the data is stable and continuous. The RTKNAVI tool in the navigation data processing software RTKLIB is used to perform RTK processing on the positioning data to improve the positioning accuracy and calculate the relative displacement of the landslide. The measurement method is designed based on the introduction of the measurement method. Equipment hardware platform, a simulated landslide measurement test was conducted on the equipment. The results show that the positioning accuracy of the measurement equipment optimized using this method is 5mm in the horizontal direction, 1.5cm in the vertical direction, the relative bearing measurement accuracy is within 4mm, and the landslide inclination angle measurement The accuracy reaches 0.01°, the average effective data meets 96.97%, and the measurement process is stable and continuous, which can meet the needs of relative seismic measurement in landslide monitoring. This method can be used to monitor the single and cumulative earthquake volume of landslides, and combine the seismic volume with the angle change. The combination can well reflect the precursors and trends of landslides and provide reliable judgment basis for landslide monitoring and early warning.