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The application provides a high-nitrogen nickel-free austenitic stainless steel bracket and a preparation method thereof, and belongs to the field of austenitic stainless steel. The method comprises the following steps: casting an initial molten steel into a consumable electrode, placing the consumable electrode in an electroslag remelting furnace, remelting and refining by using a mixed slag system of base slag and composite premelted nitride slag, and performing stepwise pressurization during the remelting process to obtain a steel ingot; homogenizing the steel ingot, and then performing multi-directional forging; performing high-temperature solid solution treatment on the forged blank, and then performing quenching; performing cold deformation processing on the plate, and then performing secondary solid solution treatment and quenching; machining the semi-finished product into the shape of a bracket, and then performing surface electrolytic polishing and passivation treatment to obtain the high-nitrogen nickel-free austenitic stainless steel bracket. Through the whole-process collaborative control from the material metallurgical source to the final forming, the harsh requirements of the high-nitrogen nickel-free austenitic stainless steel bracket on biocompatibility, mechanical properties and corrosion resistance as a long-term implanted instrument in the oral cavity are systematically met.