A dry powder fire extinguishing ball apparatus disclosed in the invention comprises a spherical shell, the spherical shell is formed by buckling an upper semispherical shell to a lower semispherical shell, the spherical shell is filled with a dry powder extinguishing agent, the center in the spherical shell is provided with a potassium perchlorate block, the potassium perchlorate block is connected with a blasting fuse, the external surface of the spherical shell is provided with a plurality of intersecting annular grooves, and the blasting fuse traverses out of the spherical shell and is wound in the annular grooves. The dry powder fire extinguishing ball apparatus has the advantages of wide application range, use convenience, easy ignition after meeting open fire, increase of the ignition probability of the blasting fuse, great improvement of the fire extinguishing effectiveness, and effective and timely fire extinguishing.