Abstract: In view of the serious corrosion and wear failure for the parts under harsh and high-temperature service conditions, the low-melting-point nickel-based alloys with different Cr content (mass fraction) were prepared by laser directed energy deposition (LDED). The effects of Cr content on the microstructure and high-temperature corrosion resistance of the alloys were investigated. The microstructure of the alloys was analyzed by scanning electron microscope (SEM), X-ray diffractometer (XRD), and electron probe microanalyser (EPMA), and the relationship between the microstructure, hardness, and corrosion resistance to high temperature molten salt was discussed. The results show that the microstructure of high Cr low-melting-point nickel-based alloys prepared by LDED is mainly composed of γ-Ni, CrB, and Cr₅B₃. With the increase of Cr content, the boride content in the alloys increases correspondingly, and the coarse Cr₅B₃ phases change from block to coarse strip gradually; the daisy (γ-Ni+CrB) eutectic phases disappear, and the lamellar (γ-Ni+Cr₅B₃) eutectic phases appear. The hardness of the alloys increases with the Cr content, reaching up to HV 360.8, mainly due to the increase of the matrix phase hardness and the boride hard phase content. Compared with TP347H stainless steels, the high Cr low-melting-point nickel-based alloys have the better resistance to high temperature molten salt corrosion, with the increase of Cr content. The alloy samples with 40% Cr show the best corrosion resistance, which is about 15 times higher than that of TP347H. During the high temperature corrosion process, the dense Cr-rich oxide films are formed on the alloy surface, which can effectively prevent the corrosion reaction from invading. On the other hand, Cr element can play the role of sulfur fixation, resulting in the excellent resistance to high temperature molten salt corrosion of the high Cr low-melting-point nickel-based alloys.