The invention belongs to the field of magnetic materials and particularly relates to a neodymium-iron-boron magnetic material and a preparation method. The neodymium-iron-boron magnetic material comprises, by weight, 29-33 parts of praseodymium-neodymium alloy, 3-6 parts of dysprosium-iron alloy, 3-7 parts of boron-iron alloy, 0.6-0.8 part of niobium-iron alloy, 5-8 parts of yttrium-iron alloy, 1.0-2.5 parts of nano silica, 0.1-0.3 part of gallium, 0.5-1 part of aluminium oxide, 1-2 parts of an antioxidant and the balance iron. The obtained neodymium-iron-boron magnetic material has the advantages that by adding the nano silica and the niobium-iron alloy into the neodymium-iron-boron magnetic material and adopting the praseodymium-neodymium alloy as a main component, the Curie temperatureis remarkably increased, the coercive force of the neodymium-iron-boron magnetic material is increased, and the application value of the neodymium-iron-boron magnetic material is increased.