Research progresses of nano-composite coating prepared by laser cladding are reviewed in brief. The microstructure, mechanical properties and application of metal matrix composites reinforced by nano-particles prepared by laser cladding are introduced. The advantages and disadvantages are compared between laser cladding and other methods for making nano-composite coatings. The key technique and the existent questions of the nano-coating prepared by laser cladding are expounded. Finally, the application and development prospect of this preparation technology are also presented.