The utility model relates to an automatic retrieve cutting device of mouth of a river material, including the frame, install workstation and blank mechanism in the frame respectively, frame detachablyis provided with the waste recycling cabinet, and the workstation is provided with location chamber and blanking mouth, and the blanking mouth lies in the location intracavity, and the blanking mouthfeeds through with recovery cabinet each other, and blank mechanism lies in location chamber top, and blank mechanism lies in to fix a position through drive slidable ground and carries out pressfitting and separation on the chamber, the beneficial effect of the utility model embody: combining recovery cabinet and blank mechanism, making blank mechanism excision mouth of a river material back, mouth of a river material directly falls into recovery cabinet through the blanking mouth and stores, realizes holistic integration production to its cutter has an abrasive surface, can carry out polishing of certain degree to product mouth of a river portion in the cutting, avoids mouth of a river position to have clout influence production, and the plant use of being convenient for improves product quality, and simple structure, and with low costs, the practicality is strong.