Using tinplate cans to pack coffee can prevent moisture and deterioration, and will not produce harmful substances due to environmental changes. There is also a special coating inside the tinplate cans for isolation and protection. At the same time, as a coffee can, after printing, it needs to be covered with a layer of varnish to increase the surface gloss and scratch resistance of the printed piece, and also increase a certain hardness, so that the printing surface coating has a certain degree of flexibility and corrosion resistance.