Abstract: Aiming at the problem of poor processing quality stability of workpieces during the electrochemical finishing袁 in order to improve the processing quality of the workpiece, the surface micro-geometry of the workpiece was taken as the research object, and the simulation model was established through the COMSOL Multiphysics simulation software. The changes in the surface mesoscopic morphology of the workpiece, the distribution characteristics and laws of the current field and the flow field of the workpiece under different processing conditions were studied respectively, and the influence of the processing mechanism was analyzed. Then, with the help of two-phase flow-phase field method, a gas-liquid two-phase flow model was established, and the influence of bubble formation and change process on the velocity distribution of the flow field was analyzed. The results show that the distribution of current is related to the mesoscopic geometric structure of the workpiece surface, and its distribution characteristics can improve the processing quality of the workpiece; the vortex formed by the cavity near the peak of the anode surface is beneficial to improve the lack of fluid in the flow field. To a certain extent, the passivation film has been hydraulically processed; the change of bubbles affects the flow velocity distribution of the surrounding electrolyte, resulting in uneven flow field velocity. By studying the influence mechanism of multi-physical fields on electrochemical finishing, the basic characteristics of each field are analyzed to improve the stability of the processing quality of the workpiece during the finishing process.