Stirrer preventing pollution

The invention provides a stirrer preventing pollution. The stirrer is composed of a stirrer core and an outer wrapping layer, wherein the stirrer core is made of a soft magnetic material, and the outer wrapping layer is made of a polymer or glass material. The stirrer core and the outer wrapping layer are prepared through hot-melting, mold pressing and heat molding. The soft magnetic material of the stirrer core can be easily magnetized and demagnetized, the stirrer rotates for stirring under the action of a magnetic field of a magnetic stirring device, and after the stirrer stops stirring andleaves the magnetic field, all or most of obtained magnetism disappears, so that the situation that in the storage and using processes of existing stirrers, magnetic impurities such as iron, nickel,cobalt and alloys thereof are attracted on the surfaces, and consequently chemical synthesis, biological experiments, medicine separation and purification and the material and substance analysis process are polluted is avoided.