Abstract: The characteristics of electric field, flow field and temperature field are analyzed, and the multi-field coupling mathematical model is established and the multi-physical field coupling numerical solution is solved by using Matlab ode45 function. The flow velocity, temperature and current density of electrolyte are obtained by using COMSOL software. Inconel 718 blade electrolysis test was completed by selecting appropriate process parameters, and the measured value of blade profile curve was obtained by using CMM, which was compared with the theoretical value of single electric field simulation and the theoretical value of multi-physical field coupling simulation. The results show that the theoretical value of multi-physical field coupling simulation is closer to the measured value of the test and can accurately simulate the actual electrolytic processing process, which can provide theoretical basis for the design of cathode tools and parameter optimization in the actual processing process, and is of great significance to improve the quality and efficiency of electrolytic processing.