The invention discloses a once-fired metal glaze surface deep-processing method.The method is characterized by comprising the following steps of 1, metal glaze making; 2, glaze spraying on the surface of a green body in a glaze throwing mode, wherein the thickness of a glaze material layer is controlled to range from 0.3 mm to 0.5 mm; 3, medium printing, wherein a layer of medium is printed through a screen mesh; 4, ink-jet printing or screen mesh and rubber roller printing; 5, mica sheet spraying, wherein the particle size of a mica sheet ranges from 10 meshes to 20 meshes; 6, convex glaze semi-polished layer printing, wherein a semi-polished material and a printing paste are mixed to be uniform, subjected to ball milling and then printed into a 70-90-mesh screen mesh which is thickened three times; 7, polishing, grading and packing, wherein after the sixth process is completed, the obtained product enters a kiln furnace to be fired, and the fired product is subjected to polishing, grading and packing.According to the once-fired metal glaze surface deep-processing method, operation is convenient, and the produced product is high in stereoscopic impression, attractive and elegant.