High-magnetism high-silicon electrical steel and preparing method thereof

The invention relates to high-magnetism high-silicon electrical steel and a preparing method thereof. According to the technical scheme, a cold rolled silicon steel plate is soaked into composite electroplating liquid, and the temperature of the composite electroplating liquid ranges from 5 DEG C to 45 DEG C; a dual-pulse power source is adopted for conducting composite electroplating on the cold rolled silicon steel plate, and the composite electroplating time ranges from 10 min to 30 min; distilled water and absolute ethyl alcohol are adopted for washing, and a silicon steel plate containing a silicon-rich electroplating layer is obtained; the surface of the silicon steel plate containing the silicon-rich electroplating layer is covered with a layer of silica powder evenly, and the thickness of a silica powder layer ranges from 30 microns to 50 microns; and the object is placed into a heat treatment furnace finally, heat preservation is carried out for 3 h to 6 h under the conditions that reducing atmospher