The main factors causing the size deviation and surface accuracy deviation of the extruder die were analyzed,the stress analysis of the die working state was carried out by using ANSYS software,the die deformations under same load before and after the wear were simulated and compared with the actual deformation of the workpiece;the surface micro situation of the die was observed by using the ultra depth microscope,the wears of upper and lower surface were compared,so the main failure factor of the mold was the corrosion of raw materials in the production process.Aiming at this phenomenon,the electrochemical machining method was used to prepare the hydrophobic surface micro morphology of 2Cr13 stainless steel.The results show that the optimized 2Cr13 stainless steel surface has a circular pit-shaped hydrophobic coating,by which the corrosion resistance of the mold can be effectively improved,and the service life of the mold can be increased.