A manufacturing method of housing of electronic device comprises following steps: providing a metal member; forming a plurality of micro anchored apertures on a surface of the metal member; placing the metal member in a plastic injection mold, wherein the plastic injection mold is set at a first temperature; and providing a molten plastic material in the plastic injection mold for integrating with the surface of the metal member with an injection molding manner, wherein the plastic injection mold is set at a second temperature, and the second temperature is higher than the first temperature.