The invention discloses an automatic scrap removing machine for an inner hole of a nut. The automatic scrap removing machine comprises a rotary disc, a guard ring, a material containing plate, positioning strips, side baffles, scrap removing bars, a rotating device and a material suction pipe, wherein a plurality of through grooves are formed in the material containing plate, scrap falling grooves which correspond to the through grooves are formed in the rotary disc, the positioning strips are respectively fixed to both sides of the tops of the through grooves, the side baffles are installed on two side walls of the material containing plate, the side baffles are connected with the positioning strips by virtue of springs, a plurality of upper baffles are fixed to the guard ring, a plurality of rows of through holes which are matched with the through grooves are formed in the upper baffles, a pressing device is fixed to the guard ring, a plurality of rows of scrap removing bars which correspond to the through holes are installed on the pressing device, the scrap removing bars are connected with a power plant, a ventilation main pipe is arranged in each scrap removing bar, a plurality of ventilation side pipes which penetrate through the side wall of each scrap removing bar are arranged on the side wall of the ventilation main pipe, and brush layers cover the surfaces of the scrap removing bars. According to the automatic scrap removing machine, the scrap removing bars with the brush layers are installed below the pressing device, so that scraps can be effectively removed from the inner hole of the nut.