The invention provides a method for preparing sintered neodymium iron boron magnets in a 3D cold printing mode and belongs to the field of powder metallurgy. By wrapping the surfaces of neodymium ironboron magnetic powder with layers of oxygen-free organic film, the magnetic powder is prevented from being oxidized in the 3D cold printing process, meanwhile, printing slurry is prepared by adoptinga low-molecular-weight and low-oxygen gelatin system, printing orientation forming of the magnets is achieved through magnetizing, and after isostatic cool pressing and sintering are performed, sintered neodymium iron boron parts in complex shapes are finally obtained. Oxygen-free organic matter is adopted for wrapping the surfaces of the neodymium iron boron powder which is oxidized easily, theoxidation problem of the magnetic powder in the forming process is controlled, the 3D cold printing neodymium iron boron slurry is prepared by adopting the low-molecular-weight and low-oxygen gelationsystem, and the oxygenation situation of the magnets in the forming process are further controlled. The sintered neodymium iron boron magnets prepared through the method provided by the invention have the good magnetic performance, near-net forming of all complex shapes can be achieved, cutting machining of magnet complex parts is omitted, the production cost is greatly lowered, and resources aresaved.