The invention discloses a mobile phone case with the metal texture. The mobile phone case is prepared from the following raw materials in parts by mass: 30 to 50 parts of thermoplastic starch, 5 to 15parts of lignin, 5 to 22 parts of ethylene and acrylic acid copolymers, 3 to 15 parts of polyvinyl alcohol, 40 to 50 parts of photo-curing materials, 3 to 6 parts of photosencitizers, 15 to 25 partsof activated monomers, 5 to 15 parts of auxiliary agents, 3 to 6 parts of Mg, 2 to 4 parts of Si, 1 to 3 parts of Co and 3 to 5 parts of Al. The vacuum non-conductive electric plating and 3D printingtechnology are combined; arithmetical operation is performed through building a primary model; the optimum mobile phone case parameter is obtained; the plastic processing temperature and water quantity can be automatically controlled; the manual operation is not needed; the production efficiency is improved; the quality of a manufactured finished product is high.