The utility model discloses an ultra -thin type magnetic core cutting assembly, which comprises a base, be equipped with the dial between outer ledge and the interior clamp plate, bolt fixedly connected with guide pulley is passed through to the both sides of dial, be equipped with a plurality of needle teeth on the circumference of dial, one side of base is equipped with the shell, the bottom of metal sand wheel is just to the top of guide pulley, one side of guide pulley is equipped with the guide rail, one side of guide rail is equipped with the guide rail apron, and this simple structure can keep off 13 to 12 of product through adding the outer ledge that enters, guarantees the quality of product processing, interior outer ledge external diameter exceeds 13 than the product, guarantees that the unloading is convenient, and 2 pendulum of needle tooth design shortly as far as possible, and the specification of needle tooth is unified, reduce material cost, and the rigidity of reinforcing needle tooth increases life, reduces material cost, reduces the management degree of difficulty, and the needle tooth carries out the prosposition design, and simple to operate reduces production cycle, and the guide rail carries out the metal inlaying design, prolongs 3 times life.