NOVELTY - Method of using magnetic control sputtering method to prepare solid oxide fuel cell film cathode involves mixing the lanthanum oxide, strontium carbonate and magnesium oxide powder at a ratio of 1-3:0.5-1.5:4-6, pressing in steel mold at 100-150 MPa to a diameter of 55-65 mm and 4-6 mm thick, sintering for 7-9 hours at 800-1000 degrees C to obtain sputtering film target material, pressing the solid electrolyte yttria stabilized zirconia powder steel mold pressing at 200-250 MPa to obtain a diameter of 12-18 mm and 0.5-1.5 thick, sintering the substrate precursor for 10-14 hours at 1200-1600 degrees C.    USE - Method of using magnetic control sputtering method to prepare solid oxide fuel cell film cathode used in batteries.    DETAILED DESCRIPTION - Method of using magnetic control sputtering method to prepare solid oxide fuel cell film cathode comprises mixing the lanthanum oxide, strontium carbonate and magnesium oxide powder at a ratio of 1-3:0.5-1.5:4-6, pressing in steel mold at 100-150 MPa to a diameter of 55-65 mm and 4-6 mm thick, sintering for 7-9 hours at 800-1000 degrees C to obtain sputtering film target material, pressing the solid electrolyte yttria stabilized zirconia powder steel mold pressing at 200-250 MPa to obtain a diameter of 12-18 mm and 0.5-1.5 thick, sintering the substrate precursor in a high temperature furnace for 10-14 hours at 1200-1600 degrees C to obtain yttrium oxide stable sputtering film with a zirconium base, placing the obtained yttrium-stabilized zirconia substrate into a plating sample table for magnetic-controlled sputtering at 2-10 cm distance between the dry stable cross substrate, vacuumizing the coating and sample chamber between 0.0001-0.0004 Pa, controlling the IS gas flow rate to 10-100 sccm gas at a control pressure of 2-6 Pa, radio frequency sputtering at 50-300W, heating the substrate to 400-700 degrees C, pre-sputtering for 10-30 minutes, removing target and the baffle of the yttria stabilized zirconia substrate, sputtering for 10-24 hours and heating for 5-10 hours at 500-800 degrees C.    DESCRIPTION OF DRAWING(S) - The drawing is an X-ray diffraction diagram of the nano-film cathode (Drawing includes non-English language text).