Abstract: Use laser cladding technology to improve the surface properties of hot stamping dies, cladding Stellite6 cobalt-based alloy powder on the surface of H13 hot work die steel, and conduct research on single-pass and multi-pass cladding process parameters with gradient values within a certain range. The influence of process parameters on the height, width, penetration depth and dilution rate of the cobalt-based cladding layer was studied. Using metallographic microscopic observation, hardness testing and XRD detection and analysis methods, the structure, hardness and phase composition of the Stellite6 cobalt-based alloy cladding layer were studied. The results show that:under laser cladding process with laser output power of 1200 W, scanning speed of 500 mm/min, powder feeding rate of 12 g/min, and overlap rate of 40%, the ideal geometric morphology, fine structure and higher hardness can be obtained.The main phase of the cladding layer is composed of γ-Co and high-hardness hardened carbides, and the microhardness has been greatly improved compared with that of the base material, indicating that laser cladding Stellite6 alloy can effectively improve the surface properties of H13 steel.