Abstract: With the increasing demand for surface service performance of components in the high-end manufacturing field, in addition to directly strengthening the material surface, coating preparation is usually used to improve its surface performance. The high hardness wear-resistant coating formed by laser cladding is currently one of the effective means of coating strengthening. It forms a metallurgical bonded thin layer with the substrate, which has strong compressive resistance and mechanical friction resistance in local areas. Due to its high energy density, high deposition efficiency, controllable preparation thickness, low thermal deformation, rapid cooling, low dilution rate, and high alloying degree, laser cladding has become a current research hotspot and gradually promoted and applied internationally. This article first summarizes the strengthening mechanism of laser cladding to improve material hardness, including grain refinement, lattice distortion, phase changes, etc. However, due to the limitations of laser cladding technology itself, the coating is prone to defects. Then, other surface strengthening technologies, such as ultrasonic rolling technology and heat treatment, were summarized to form a composite strengthening technology of laser cladding technology, which can further improve the surface hardness effect of the material and achieve better performance.