Precipitation-hardened martensitic stainless steels have excellent comprehensive mechanical properties and corrosion resistance, and are widely used in aviation, aerospace, Marine and petrochemical industries. In this paper, a 17-4PH martensitic stainless steel coating was prepared on the surface of low carbon steel by hot-wire laser cladding technology. The microstructure and tribocorrosion properties of the coatings were analyzed. The results show that the microstructure of the coating is uniform, compact, and no defects such as cracks and pores. The coating is mainly composed of martensite phase. The average hardness of the cladding zone is about 310HV0.1, which is about 1.5 times of the hardness of the substrate. The corrosion current density is 6.583×10?8 A/cm2, showing excellent corrosion resistance. In 3.5% NaCl solution, with the increase of friction load, the open circuit potential of the coating decreases, the friction coefficient increases, the corrosion potential decreases, and the corrosion current density increases. The friction has a significant promoting effect on the corrosion. This paper can not only provide new ideas and methods for surface modification of materials, but also provide data for the use of 17-4PH coating in harsh corrosive wear environment.