Sand making machine

The utility model relates to a sand making machine. The sand making machine comprises driving devices, a crushed aggregate box body and a rotor assembly, wherein a feeding hole is formed in the top of the crushed aggregate box body; the rotor assembly is arranged in the middle of the crushed aggregate box body and comprises a spindle and rotor frames fixed on the spindle; the driving devices are arranged outside the crushed aggregate box body and are connected with the spindle; a plurality of board hammers are installed on the rotor frames; an adjusting board is arranged on the crushed aggregate box body, close to the board hammers and is connected with the crushed aggregate box body by a positioning mechanism; when the positioning mechanism is screwed, the adjusting board can be close to or far from the board hammers; and a grate board is fixed at the bottom of the crushed aggregate box body and is bestrewed with grate holes in uniform sizes.