The invention discloses a magnetic aluminum nitride thin film material of a sphalerite structure and a preparation method and an application. In Sc-doped aluminum nitride, the crystal structure of the Sc-doped aluminum nitride is the sphalerite structure, and Sc elements occupy the position of part of Al elements in crystal lattice. The molar ratio of Sc to Al is 76:24. The molar ratio of the Al elements and the Sc elements to nitrogen elements is 1:1. The material prepared through the method is a diluted magnetic spin semiconductor material with sphalerite, the Curie temperature of the material of the sphalerite structure is high, the room temperature stability is good, and the spin injection efficiency is high; the crystal structure of reported diluted magnetic semiconductor GaN belongs to a hexagonal crystal system, the magnetism is weak and close to the super paramagnetic properties, and therefore application prospects are broad.