Abstract: In this review, the latest research achievements in the preparation of Co-based composite coatings by laser cladding technology are preliminarily discussed. The research focuses on the characteristics of cladding materials and the optimization of laser cladding process parameters. It is pointed out that WC-Co coating shows excellent wear resistance with its hardness as high as 1200HV, and WC is the key contributor to this performance. At the same time, the hardness of TiN-VC reinforced Co-based composite coating can reach 550HV, and with the increase of TiN content, the hardness of the coating is significantly improved. According to the laser cladding process, the precise control of process parameters has a decisive influence on the microstructure and properties of the coating. The results show that when the scanning speed is generally controlled at 6～8mm/s, the laser power is set in the range of 1.2～1.6kW, and the energy density is lower than 90J/mm~2, the microstructure and properties of the coating can be significantly optimized. The reasonable setting of these parameters not only ensures the uniformity and compactness of the coating, but also significantly improves the hardness and wear resistance of the coating. To sum up, this study provides a certain technical reference for the preparation of Co-based composite coating by laser cladding, and has certain significance for improving the coating performance and expanding the application field.