Workpiece alignment teaching aid for four-jaw chuck

The utility model relates to a workpiece alignment teaching aid for a four-jaw chuck. Comprising a bottom plate and a supporting plate fixed to the bottom plate, a rotating shaft is installed on the supporting plate, a simulation chuck is installed at the inner end of the rotating shaft, four single-action adjustment simulation clamping jaws are installed on the edge of the front portion of the simulation chuck, and workpieces are loaded between the simulation clamping jaws; a rail is further installed on the front portion of the bottom plate, a rail block is installed on the rail, a magnetic base is attracted and fixed to the rail block, a vertical supporting rod is installed on the magnetic base, a supporting rod is installed on the supporting rod through an outer side fixing piece, and a dial indicator is fixedly installed on the front portion of the supporting rod through an inner side fixing piece. The measuring end of the dial indicator faces the workpiece; and the locking assembly is used for fixing th