In order to prevent seawater from flowing back into cities, road construction in Indonesia’s coastal areas often requires the construction of breakwaters on the outside of bridges. The area is widely distributed on deep soft foundations, and the foundation soil at the breakwater is reinforced using the preloading method. The road is built on friction prefabricated pipe piles as the bridge foundation. Using PLAXIS 3D to analyze the beneficial effects of bamboo piles and bamboo rafts as working cushion layers on the filling of deep soft soil foundation and the settlement and deformation characteristics of the foundation, and simulating the adverse effects of lateral compression on the bridge pile foundation caused by the soft soil foundation under different loading conditions of the sea embankment. The results show that the flexible working cushion layer of bamboo piles and bamboo rafts is conducive to improving the loading stability of the soft soil foundation, when the second layer of pile is consolidated and stabilized before carrying out bridge pile foundation construction, the lateral compression generated by the soil will be smaller.