The invention relates to the field of ceramic manufacturing, in particular to a ceramic decoration firing method for lowering the dissolving-out amount of lead and cadmium with a low sodium salt solution. According to the ceramic decoration firing method for lowering the dissolving-out amount of lead and cadmium with the low sodium salt solution, in the decoration firing process, atomized low sodium salt is sprayed into a decorating firing kiln at the high-temperature section of the decorating firing kiln, softening and dissolution of an enamel surface are facilitated through sodium ions, and thus heavy metal attached to an enamel layer can be encircled and solidified. The ceramic decoration firing method has the following advantages that first, the dissolving-out amount of the heavy metal in a ceramic product after decoration firing is greatly lowered; second, the work of reducing the heavy metal is completed while decoration firing is synchronously performed, and the technology is simple; and third, the low sodium salt solution is used, and thus preparation cost is low.