Insulating soft magnetic metal powder, preparation method thereof and magnetic powder core

The invention discloses insulating soft magnetic metal powder and a preparation method thereof and a magnetic powder core, the insulating soft magnetic metal powder comprises soft magnetic metal powder and an insulating layer wrapping the soft magnetic metal powder, the insulating layer comprises multiple hexagonal boron nitride layers which are sequentially distributed in the radial direction of the soft magnetic metal powder, and the hexagonal boron nitride layers are arranged in the radial direction of the soft magnetic metal powder. Each hexagonal boron nitride layer is of a single-layer hexagonal net-shaped structure, boron atoms and nitrogen atoms are distributed on vertex angles of the hexagon in a crossed mode, the adjacent hexagonal boron nitride layers are connected through Van der Waals force, the D50 particle size of the soft magnetic metal powder ranges from 10 micrometers to 60 micrometers, and the thickness of the insulating layer ranges from 5 nm to 100 nm. The insulating soft magnetic metal p