The permanent magnetic cylinder core is made of the latest developed rare earth permanent magnetic material, with a particularly high magnetic field strength and a wide magnetic field amplitude. The outer shell is made of refined stainless steel structure, with closed magnetic properties, which can fill the interior with a strong magnetic field, with good iron removal effect, and can effectively protect various hosts from working properly. It is flexible and convenient to install, does not occupy space, and does not require any power. It is an ideal equipment for removing iron from raw materials in feed mills, grain, oil, flour processing plants, grain depots and other industries.