Abstract: Taking wave energy oscillating flapping wing linear structure as the object, the fluid-structure interaction mechanism and energy conversion efficiency of wave energy acquisition process are studied. Using the random wave theory,the wave height and period of the wave are mathematically described and numerically simulated using Matlab. Based on the linear wave theory,the fluid-structure interaction force is equivalent to the superposition of the hydrostatic recovery moment,the excitation moment and the diffraction moment. The mathematical calculation formulas are established. Using AQWA software, the fluid-structure interaction processes between wave and oscillating flapping wings are simulated and analyzed,the fluid-structure interaction forces are solved,the dynamic characteristics of oscillating flapping wings is analyzed,and its conversion efficiency are calculated. The research results show that the conversion efficiency of the oscillating flapping wings of the conical bottom streamline structure is 5% higher than that of the flatbottomed or round-bottomed streamline structures. The research conclusions provides a theoretical basis and analysis method for the development of the oscillating flapping wing wave energy acquisition device.