Abstract: In order to effectively suppress the fluctuation of the output power of marine PV and improve the penetration of PV in the marine power grid,this paper takes the "COSCO Tengfei" ship as the research object,applies the theory of Model Predictive Control（MPC） to the research of marine photovoltaic storage power generation system,and uses the energy storage charging/discharging to achieve two-way power control.Firstly,the model of marine photovoltaic storage power generation system is established,and the MPC strategy to improve the output level of lithium battery is designed.Secondly,the simulation is made in MATLAB.The simulation results show that the proposed method can effectively improve the control accuracy while suppressing the photovoltaic grid connection fluctuation,and realize the optimal control of lithium battery charging and discharging process in the marine power system.Finally,based on the MPC strategy,the influence of the capacity of the energy storage battery on the flattening effect is analyzed,and the conclusion that the MPC energy storage module can flatten the PV with different permeability is drawn,which provides a solution for the application and development of the high permeability PV power generation system on ships.