The invention relates to an automatic division grinding machine which comprises a main frame, a charging mechanism, a division mechanism, a feeding mechanism, a grinding mechanism and a material receiving rotation mechanism. The charging mechanism, the division mechanism, the feeding mechanism, the grinding mechanism and the material receiving rotation mechanism are arranged on the main frame; the charging mechanism is arranged above the division mechanism and connected with the division mechanism through a division hopper, a feeding pipe port of the feeding mechanism is connected with a division discharging port of the division mechanism through a hose, a discharging pipe port of the feeding mechanism is connected with a mortar feeding port of the grinding mechanism through a pipeline, and a mortar discharging port of the grinding mechanism is connected with a material receiving port of the material receiving rotation mechanism through a discharging mechanism. The automatic division grinding machine automatically feeds, divides, loads, unloads and moves a material cup, corresponding cleaning and dust collection devices are equipped, operating environments are improved, and dust pollution is completely eradicated.