A flexible molding process for a magnetic pole protective layer, comprising: assembling magnet steels at respective positions on a side wall surface of a magnetic yoke, laying a reinforcing material and a vacuum bag in the listed sequence on the magnet steels and the side wall surface of the magnetic yoke, wherein the vacuum bag, the magnet steels and the side wall surface of the magnetic yoke form a sealed system; performing an impregnation process, comprising vacuumizing the sealed system to allow an impregnation liquid to be injected into the sealed system, to achieve infiltration and impregnation; performing a curing process after the impregnation process, and wherein the impregnation liquid and the reinforcing material are cured to form a protective layer; and characterized in that the flexible molding process comprises: heating the sealed system and/or emitting ultrasonic waves to the sealed system while performing the impregnation process; and after the protective layer is cured, acquiring positions of holes (qp) in the protective layer, emitting ultrasonic waves to portions of the protective layer at positions of holes (qp) in a surface layer of the protective layer, to break the portions of the protective layer at the positions of the holes (qp) in a surface of the protective layer, and performing an anti-corrosion coating treatment to the broken portions. assembling magnet steels at respective positions on a side wall surface of a magnetic yoke, laying a reinforcing material and a vacuum bag in the listed sequence on the magnet steels and the side wall surface of the magnetic yoke, wherein the vacuum bag, the magnet steels and the side wall surface of the magnetic yoke form a sealed system; performing an impregnation process, comprising vacuumizing the sealed system to allow an impregnation liquid to be injected into the sealed system, to achieve infiltration and impregnation; performing a curing process after the impregnation process, and wherein the impregnation liquid and the reinforcing material are cured to form a protective layer; and characterized in that the flexible molding process comprises: heating the sealed system and/or emitting ultrasonic waves to the sealed system while performing the impregnation process; and after the protective layer is cured, acquiring positions of holes (qp) in the protective layer, emitting ultrasonic waves to portions of the protective layer at positions of holes (qp) in a surface layer of the protective layer, to break the portions of the protective layer at the positions of the holes (qp) in a surface of the protective layer, and performing an anti-corrosion coating treatment to the broken portions. heating the sealed system and/or emitting ultrasonic waves to the sealed system while performing the impregnation process; and after the protective layer is cured, acquiring positions of holes (qp) in the protective layer, emitting ultrasonic waves to portions of the protective layer at positions of holes (qp) in a surface layer of the protective layer, to break the portions of the protective layer at the positions of the holes (qp) in a surface of the protective layer, and performing an anti-corrosion coating treatment to the broken portions.