The invention provides a magnetic resin composition, a magnetic film and application thereof. The magnetic resin composition comprises (A) a magnetic filler, (B)
epoxy resin, (C) a curing agent and (D) a flexibilizer, the magnetic filler (A) comprises
carbonyl iron powder (A1), FeSiCr
alloy (A2) and iron-based nanocrystals (A3); based on the total
mass of the magnetic resin composition as 100%, the content of the (A) magnetic filler is 85% or more; based on 100% of the total
mass of the magnetic filler (A), the content of the
carbonyl iron powder (A1) is 55%-65%, the content of the FeSiCr
alloy (A2) is 15%-25%, and the content of the iron-based nanocrystalline (A3) is 15%-25%. According to the magnetic resin composition and the preparation method thereof, specific types of magnetic fillers are introduced and compounded according to a specific content, so that the magnetic resin composition has relatively high magnetic
conductivity and relatively low magnetic loss after being cured, and meanwhile, the
binding force with a
copper layer is relatively high.