The invention relates to a preparation method of permanent ferrite, which comprises the following steps of: 1, selecting the raw materials which comprises Fe2O3, SrCO3, La2O3,Co3O4,CaCO3 and water; 2, carrying out wet-mixing; 3, drying; 4, pelletizing and presintering; 5, roughly crushing; 6, putting rough powder into a ball mill and adding CaCO3, SiO2, Al2O3 and calcium gluconate, and fine crushing; 7, filtering sediments; 8, pressing under a magnetic filed in a wet manner; 9, sintering; 10, grinding; 11, cleaning; and 12, testing the property. During the fine crushing of the step 6, H3BO3 is added. According to the preparation method of the permanent ferrite, through improving primary and secondary formulas, the property of the sintered permanent ferrite is increased, the environment problem is improved, and the production cost is reduced.