Abstract: The simulation and prediction of wax deposition in oil pipelines are significant for the safe and efficient operation of long-distance pipelines. Aiming at the existing methods for simulating wax deposition in crude oil pipelines cannot accurately represent the physical process of wax deposition, a fluid-solid coupling simulation method for wax deposition in crude oil pipelines based on SPH is proposed. Firstly, the Fourier heat conduction model is introduced into the SPH method to simulate heat transfer. Secondly, a wax deposition model based on viscosity phase transformation is proposed to describe the wax deposition process. Finally, a nearest neighbor position correction algorithm is designed to achieve fluid-solid coupling with dynamic solid boundaries. Under different pipeline conditions, the authenticity of wax deposition simulation and the runtime efficiency are analyzed. Compared with mainstream methods, the proposed method can simulate the wax deposition phenomenon in crude oil pipelines realistically. Meanwhile, the simulated wax deposition would restrict the crude oil flow path.