The invention provides a glass back cover. The glass back cover comprises a 3D glass plate, a coating layer connected with the 3D glass plate, and a shielding layer connected with the side, far away from the 3D glass plate, of the coating layer. The size of the 3D glass plate is matched with the size of a rear cover of a mobile terminal, and the coating layer comprises a multilayer transparent medium layer. The shielding layer is made from nonconductive absorbable material. The invention also provides a preparation method for the glass back cover. The preparation method comprises the steps ofproviding a formed 3D glass plate; plating the inner surface of the 3D glass plate with the coating layer; plating the side, far away from the 3D glass plate, of the coating layer with the shielding layer; and obtaining a finished product of the glass back cover. The finished product of the glass back cover can present color. The glass back cover and the preparation method for the glass back coverhave the advantages of simple process, high product yield, and energy conservation and environmental protection.