The application discloses a modified slow-release
rare earth alloy, a sintered
neodymium-iron-
boron magnet and a preparation method thereof. 1‑m X m , m is an atomic percentage content, 35at%<=m<=76at%; wherein, RE is a
rare earth element, composed of light
rare earth elements and heavy rare earth elements; X is selected from at least one of Ga, In, Si, Ge, Sn, Sb, Bi, S, Se and Te. The modified slow-release rare earth
alloy can improve the magnetic performance and high-temperature stability of the sintered
neodymium-iron-
boron magnet.