The metal container making process includes the following steps: the first extruding or stretching metal material into cylinder, cutting edge in the cylinder openings, gradually reducing mouth with several forming molds of gradually reduced inner diameters, cutting the mouth edge, making thread fitting that in the container cover in the mouth, surface cleaning, stoving and surface polishing, spraying paint to the inner surface and stoving, and spraying paint to the outer surface and stoving. Thus made metal container has round transition arc in the mouth and stable product quality.