The invention provides a method for continuous laser impacting micro particles to be melt-injected through injecting force formed by laser impacting work. The method is characterized in that a continuous laser beam is used to penetrate through a restraint layer for scanning a composite pre-arranged layer prearranged on the surface of a material to be modified, wherein the composite pre-arranged layer is formed by mixing a binder which inducing a laser impacting waves effectand the macro particles to be melt-injected; and through reasonable matching of parameters such as the melting point and the boiling point of the binder, the materials to be modified and the micro particles to be melt-injected, the binder is gasified to form the laser impacting waves under inducing of the continuous laser action, and the micro fine particles to be melt-injected are injected into a surface molten pool of the material to be modified, so that the micro particle reinforced composite layer is formed in situ. By means of the method, metallurgical bonding between the micro particles and the material to be modified is achieved in the composite material layer obtained from the surface of the material to be modified, the technical barrier that the micro particles are difficult to melt-inject in the prior art is broken, meanwhile, the injection depth of the micro particles is deep, the texture is fine,the enhanced particles are evenly distributed, and the micro particles are not restricted by plasticity of the material to be modified.