Electrochemical finishing can improve the surface roughness of turning parts and effectively remove micro two side-direction burr on the edge of the workpiece, so as to improve the surface integrity of workpiece. In the parameter range that electrochemical finishing with the moving cathode can achieve good surface finishing effect, the electric field distribution at the burr part is changed by changing the shape of the cathode, and then the material removal speed is changed to achieve burr removal. The current density distribution on the burr surface and the difference between the current density at the top and bottom of the burr are simulated and analyzed under the conditions of different shapes of cathode, and the cathode shape that makes the burr height decrease rapidly is obtained. The workpiece is processed by electrochemical finishing with the moving cathode, and the variation law of surface roughness Ra value and burr height value is obtained. When the convex fillet cathode is used, the current density difference between the top and bottom of the burr is large, and the burr removal efficiency is high. The surface roughness Ra value has an inflection point when the processing time is within the range of 16~18 min, and the Ra value is reduced from 2.76 μm to 0.32 μm after 20 min; The burr height value has an inflection point when the machining time is within the range of 10~14 min, and it is reduced from 17.10 μm to 2.64 μm after 20 min. It is the same order of magnitude as the surface roughness Rz value. By changing the cathode shape, the micro two side-direction burrs on the edge of the turning workpiece can be effectively reduced in the process of electrochemical finishing, and the service performance of the parts can be improved. This method is feasible in practical application.