Sand making machine

The utility model relates to a sand making machine. The sand making machine comprises driving devices, a spindle and a crushed aggregate box body installed on the spindle, wherein the driving devices are arranged at the two ends of the spindle; and the spindle is horizontally arranged on the central axis of the crushed aggregate box body. The sand making machine is characterized in that the crushed aggregate box body comprises a feeding hole formed in the top and rotor discs arranged at the left and right ends respectively; the two rotor discs are fixed together with the spindle; a plurality of hammer heads are fixed between the two rotor discs via tandem axles; a grate board and a discharge hole below the grate board are arranged at the bottom of the crushed aggregate box body; and the grate board is bestrewed with grate holes in uniform sizes.