Abstract: Ni60 composite coatings with different LaB₆ mass fractions were fabricated on 316L stainless steel substrates by laser cladding, and the LaB₆-free L0 coating was set as the blank control group. The regulation law of LaB₆ addition amount on phase composition, microstructure, microhardness, tribological property at 600℃ and neutral salt spray corrosion resistance for 48 h was systematically investigated. The results reveal that Ti₂AlC and LaB₆ fully decompose in the high-temperature molten pool and in-situ form multiple reinforced phases including TiC, Cr₇C₃ and Ni₃B, and sound defect-free metallurgical bonding is achieved between all coatings and the substrate. As the mass fraction of LaB₆ increases from 0wt.% to 25wt.%, the grain size of coatings decreases first and then rises, while the compactness and element uniformity improve at first and deteriorate afterwards. The L2 coating with 15wt.% LaB₆ possesses the densest microstructure and the fewest defects, with an average microhardness of 718.5 HV_0.5, which is much higher than the L0 control sample (380.8 HV_0.5). At 600℃ dry sliding condition, coexisting TiO₂-Cr₂O₃-Al₂O₃ oxides can be detected on the worn surface of L2, which can isolate the direct contact of friction pairs. Its average friction coefficient is 0.178 and wear rate is 1.81×10⁻⁵ mm³/(N·m), showing the best high-temperature wear resistance among all samples. After 48 h neutral salt spray corrosion, intact and compact passive film forms on L2 surface, and its average pitting depth and weight loss per unit area are obviously lower than L0, L1 and L3. It can be inferred from the experimental results that proper LaB₆ addition can simultaneously realize grain refinement strengthening, dispersion strengthening and passive film optimization, thus comprehensively promoting the high-temperature wear and corrosion resistance of coatings. This work provides experimental support for integrated surface protection of 316L stainless steel serving under high-temperature and marine corrosion environments.