For the treatment of deep silt soft foundation on the beach, the method of bagged sand wells and preloading is often used. The main principle is to set up boreholes and bagged sand wells in the soft foundation area, so that the water in the silt layer is discharged through the bagged sand wells. At the same time, the preloading load compacts the lower soft foundation, achieving the goal of accelerating settlement and stabilizing the foundation in advance. Soft foundation settlement monitoring is an important technical link of this treatment plan. Through data processing and analysis at different stages, the stacked soil is loaded and unloaded in a hierarchical manner, ensuring the preloading effect and controlling reasonable workload.