The invention discloses a method for printing a metal gate line, which comprises the following steps of: printing a first contact silver paste layer on the surface of a film-coated crystalline silicon chip; drying the first contact silver paste layer; printing a second conductive silver paste layer on the first contact silver paste layer; and drying and sintering silver paste. The method has the advantages that: a film-coated monocrystalline silicon or polycrystalline silicon chip is taken as a printing substrate, and the first contact silver paste layer is printed, so that the metal gate line is in good ohmic contact with the substrate; and the second conductive silver paste layer is printed on the surface of the first contact silver paste layer, so that the conductive property of the gate line is improved, and various electrical property parameters of a battery are improved.