The invention discloses a magnet net for a vertical mixer feeding opening. The magnet net comprises a plurality of parallel cylindrical magnets, wherein the cylindrical magnets are connected with one another by transverse parting strips, and are longitudinally arranged in the mixer feeding opening along the discharging direction. The magnet net can conveniently adsorb iron impurities in a raw material during feeding, is convenient to use and flexible to move, is applied to the feeding opening or a circulation opening of a mixer, and is simple in structure and efficient.