The invention provides a method for forming a functionally graded material on basis of selection laser melted powder metallurgy. The forming method comprises the steps that an SLM technology and a powder sintering technology are combined, SLM forming is conducted firstly, a material with different components are laid on different cross sections of parts, the contour of the material and the partial structure inside the part are formed through laser melting, after the contour of the whole part is formed, the part is subjected to high-temperature sintering, and unmelted powder inside the contour of the part is sintered. According to the method, the thickness of the functionally graded material can be accurately controlled, and an FGM material with the excellent quality is prepared; meanwhile, parts with any complex shapes can be manufactured rapidly and accurately, the manufacturing procedures are greatly simplified, the processing cycle is shortened, and the production cost is lowered.