Abstract: Ductile iron has excellent mechanical properties and has been widely used in the industrial field, but the extreme application environment puts forward more demanding requirements for its surface hardness, wear resistance and corrosion resistance. In this experiment, high hardness and crack-free 3Cr13 martensitic stainless steel coatings were successfully prepared on the ductile iron surface based on laser cladding technology. The effects of different powder feeding methods and energy densities on the forming quality of the cladding layer were explored by controlling variables, and the microstructure, hardness, wear resistance and corrosion resistance of the cladding layer were compared. The results show that the prepared 3Cr13 fused cladding layer is in excellent metallurgical bonding with the substrate under the synchronous powder feeding method and energy density of 124 J/mm². The microstructure of the coating consists of α-Fe, residual γ-Fe and（Cr,Fe）₇C₃ phases. Its microhardness is up to 531.96 HV0.2, which is 2.96 times of that of cast iron matrix（180 HV0.2）. Under the same wear conditions, its wear rate is 0.235×10^-3g/m, only 58% of the wear rate of cast iron(0.407×10^-3g/m). The main wear mechanisms of the 3Cr13 martensitic stainless steel coating are slight abrasive wear plastic deformation, adhesive wear and oxidative wear. In the salt spray corrosion environment of NaCl with mass fraction of 3.5%, the coating has a self-corrosion potential of-0.409 V, which is 0.432 V higher compared with the self-corrosion potential of cast iron（-0.841 V）, the self-corrosion current is less than the self-corrosion current of cast iron, the electrochemical impedance is greater than the electrochemical impedance of cast iron,and the corrosion resistance performance is better. In conclusion, 3Cr13 laser cladding layer significantly improves the hardness, wear resistance and corrosion resistance of ductile iron surface.