FIELD: machine building. SUBSTANCE: invention relates to the electrical machine building, and can be used to manufacture the magnetic-dielectric material in form of sheets or plates to produce the magnetic wedge of the electrical machines. The ferromagnetic component, epoxy resin and curing agent are mixed, the obtained mass is poured in the die mould with reinforcement element in form of the glass fibre fabric, and then treatment by the magnetic field is performed during pressing. The ferromagnetic component is added in form of the nano size particles of ferriferrous oxide with size up to 100 nm, and magnetic field is applied with intensity at least 800 oersted to the magnetic-dielectric mass with preliminary determined degree of solidification max. 30%. EFFECT: material is manufactured for the magnetic wedge production ensuring decreasing of the additional motor losses and ensuring required magnetic permittivity.