High-partial-discharge insulating material for oil-cooled motor and preparation method of high-partial-discharge insulating material

The invention belongs to the technical field of materials, and discloses a high-partial-discharge insulating material for an oil-cooled motor and a preparation method of the high-partial-discharge insulating material. The high-partial-discharge insulating material for the oil-cooled motor comprises a first surface coating, a first mica aramid paper layer, a first adhesive layer, a film layer, a second adhesive layer, a second mica aramid paper layer and a second surface coating which are sequentially arranged from top to bottom, wherein the first adhesive layer and the second adhesive layer are both acrylic acid modified polyurethane glue, and the first surface coating and the second surface coating are epoxy resin modified polyurethane coatings. According to the material, mica aramid paper formed by mixing mica powder and aramid fibers and a polyphenylene sulfide film are compounded, the corona resistance advantage of mica is fully utilized, the partial discharge performance of the material is improved, and