In order to improve the system operation stability and energy utilization efficiency of wave glider during long-term operation, a multi-objective optimization-based energy management strategy (EMS) is proposed. The mathematical model of the wave glider energy management is constructed. The model is solved through ε-constraint and weighted sum method. The simulation test is designed to validate the effectiveness of the proposed EMS model and to analyze its performance in different task modes. The results indicate that the proposed EMS is able to achieve optimal power scheduling for each device while satisfying the underlying operation constraints, and improve the long-term operational stability and energy exploitation efficiency of the wave glider.