The invention relates to an automatic nail blank cutting, classifying and boxing device. The traditional nail blank cutting is dependent on manual work and the efficiency is not high. A guide rail is arranged on a base; a movable conveyor belt is arranged in the guide rail; material boxes are arranged in the guide rail at equal intervals; an upright post vertical to the base is arranged in a guide rail enclosing area; the top of the upright post is connected with a cross beam; an air cylinder is arranged over the other end of the cross beam; the center of a piston rod cutter frame in the air cylinder is fixed; two sides of the cutter frame are fixedly provided with cutters; the rear end of the cutter frame is connected with a surplus material removing device through a connecting beam; theouter side walls of the cutters are fixedly provided with boxing devices; and classifying boxes are arranged under the boxing devices. The automatic nail blank cutting, classifying and boxing device has the advantages of high automation degree and high work efficiency.