Ionic liquid hydrogen compressors have the advantages of good cooling effect, low energy consumption, fewer vulnerable parts, and high reliability, making them the preferred model for hydrogen pressurization in future high-pressure hydrogen refueling stations. In order to clarify the influence mechanism of operating parameters of ionic liquid hydrogen compressor on the oscillation flow characteristics of gas-liquid two-phase inside the working chamber, this paper establishes a transient thermal dynamic characteristics analysis model of ionic liquid hydrogen two-phase in compressor fluid solid coupling based on CFD dynamic grid technology and VOF multiphase flow model, and explores the oscillation flow and morphology evolution of gas-liquid two-phase under different piston motion velocities and impacts. The results shows that the motion state of ionic liquids in cylinders is closely related to piston motion and valve turbulence impact. As the speed of the hydraulic pump increases, the piston speed and airflow speed also increase. The oscillation motion of the gas-liquid phase intensifies, the turbulence effect increases, the degree of fragmentation of the gas-liquid interface increases, and the amount of ionic liquid overflow also increases rapidly. From 120 RPM to 600 RPM, the amount of ionic liquid overflow increases by 4.7 times. In the process of ionic liquid hydrogen compressor design and application, lower speed can be taken to weaken the ionic liquid-hydrogen two-phase oscillation movement intensity, while reducing the amount of ionic liquid overflow.