The invention discloses an indium-iron composite spherical microcrystal composite layer. A surface material layer is arranged on a part and comprises larger indium-iron composite spherical microcrystal units of which the indium content exceeds 50% (Wt%) and the total content of indium and iron exceeds 55% (Wt%), each larger indium-iron composite spherical microcrystal unit is formed by close connection of at least four spherical crystal grains or nearly-spherical crystal grains, and the indium-iron composite spherical microcrystal units are approximately regularly and closely distributed and arrayed in rows or in lines; a base body material can adopt metallographic structures which are made of other components and are in other shapes, and the surface material layer and the base body material are integrated to form the indium-iron composite spherical microcrystal composite layer.