Bonded ferrite magnetic powder, preparation method thereof and bonded permanent magnet

The invention discloses bonded ferrite magnetic powder, a preparation method thereof and a bonded permanent magnet, which belong to the technical field of magnetic materials. The magnetic powder comprises a principal phase with the molecular formula of (M1-xLax)O.n(Fe1-yZnyBiz)2O3, wherein M denotes at least one of strontium and barium; x, y, z and n denote mole ratios, and meets x=2mn(y+z); x is0.01 to 0.40; z/y is more than or equal to 0.01 and less than or equal to 0.3; n is 5.50 to 6.40; and m is 0.90 to 1.10. The invention also provides the preparation method for the bonded ferrite magnetic powder, and the bonded permanent magnet. Bismuth oxide is added in certain proportion in a material mixing process, and chloride is added in certain proportion as a fluxing agent in the material mixing process, so the reduction of pre-burning temperature and control over the growth of crystal grains and the grain size distribution of the magnetic powder are realized, and the prepared magneticpowder is endowed with the