Abstract With the gradual decrease of land resources, people pay more and more attention to the development of marine resources, and the use of marine wave energy has become the focus of people. In this paper, the pipeline parameters and pipeline model of the floating power generation device are set up. The comprehensive simulation of the hydraulic system is established by AMESim software. Under the condition of ensuring the normal results of the simulation model, the simulation model is solved by the solver to obtain the pressure fluctuation in the pipeline. The influence of inner diameter and length of pipeline on pressure fluctuation is analyzed. At the same time, through the feedback of pipeline pressure and the actual situation analysis, the feasible suggestions are given, which has certain reference significance for the design of hydraulic pipeline and provides theoretical support for the actual large wave power generation.