Taking the acquisition mechanism of the oscillating flapping-wing wave energy power generation device as the research object, the dynamic modeling and energy conversion efficiency of the acquisition mechanism are studied. According to the working principle of the acquisition mechanism of the oscillating flapping-wing wave energy power generation device, the rotational dynamic model of the acquisition mechanism and the corresponding relationship between the model parameters and the mechanism design parameters are established; based on the moment of momentum theorem, the dynamic differential equation of the acquisition mechanism and the system transfer function are established, and the time domain response and frequency characteristics of the system are analyzed. The calculation formula of the conversion efficiency of the collection mechanism is established, and the influence of different sea conditions on the energy collection efficiency is analyzed. The random wave signal is used as the input signal of the system, and the MATLAB software is used for simulation analysis to solve the characteristic quantities of the model in the time domain and frequency domain. The ANSYS-AQWA software is used to carry out the research, and the linear regular wave is used to simulate and analyze the motion response of the acquisition mechanism and the wave energy acquisition power under different sea conditions. The research results show that the acquisition mechanism of the oscillating flapping-wing wave energy power generation device can work stably under both regular wave and random wave conditions, and the conversion efficiency of the acquisition mechanism can reach 44.04% under three-level wave conditions. The research process provides an effective reference for the development of the acquisition mechanism of the oscillating flapping-wing wave energy power generation device.