Automatic grinding workstation for large screws

The invention relates to the technical field of screw grinding, in particular to an automatic grinding workstation for a large screw. The position changing mechanism is located on one side of the robot and used for containing and limiting a screw to be ground, the grinding tool replacing device is located on the other side of the robot, and the robot, the position changing mechanism and the grinding tool replacing device are all installed on the grinding workbench. The grinding tool replacing device comprises a grinding tool containing table and a plurality of grinding wheel machines arranged on the grinding tool containing table, an abrasive belt mechanism is further arranged on the grinding tool containing table, the abrasive belt mechanism comprises an abrasive belt and an abrasive belt driving assembly capable of driving the abrasive belt to rotate, and the abrasive belt driving assembly can be grabbed by the robot. After the prior art is improved, the to-be-ground screw is ground and polished through the