Abstract: In order to further improve the processing efficiency and quality of abrasive flow polishing TC4 titanium alloy, a mechanical vibration-assisted abrasive flow polishing method was proposed, and the abrasive flow polishing test of TC4 titanium alloy was carried out to explore the influence of mechanical vibration on the material removal efficiency, surface roughness and surface topography of the workpiece. The results show that when mechanical vibration is applied to the workpiece, the “shear thickening” effect of the polishing fluid is enhanced, and the ability of abrasive particles to remove the surface material of the workpiece is increased. Compared with no mechanical vibration, the material removal efficiency of the workpiece with mechanical vibration is increased by 19.90%, the surface roughness is reduced by 19.58%, the processing defects such as scratches and depressions on the workpiece surface are reduced, and the surface quality is improved, which can accumulate experience and provide basic data for the actual production and processing.