Neodymium-iron-boron permanent magnet and preparation method and application thereof

The invention belongs to the technical field of sintered neodymium-iron-boron rare earth permanent magnets, and provides a neodymium-iron-boron permanent magnet and a preparation method and application thereof. The chemical formula of the neodymium-iron-boron permanent magnet is (Pr25Nd75) aYbGdcCedFe, and the balance is ComTinMkBy, wherein the subscript represents the mass percent; 12 < = a < = 20, 3 < = b < = 8, 1 < = c < = 5, 8 < = d < = 11, 7 < = m < = 10, 0.2 < = n < = 0.6, 0.7 < = k < = 1.5, 0.8 < = y < = 0.96; m is one or more of Cu, Al, Nb, Zr and Ag. The neodymium-iron-boron permanent magnet is free of heavy rare earth, and the high-abundance rare earth Y and Ce are used, so that the formula cost of the permanent magnet is reduced, and the working temperature field loss rate of the permanent magnet is reduced; compared with a conventional permanent magnet formula, the rare earth permanent magnet has the advantages that the usage amount of heavy rare earth is saved by about 0.6% by weight, comprehensi