Chuck for lathe

The chuck for the lathe comprises a chuck body, a clamping jaw body, an installation block and a workpiece body, a driving assembly enabling the clamping jaw body to slide on the chuck for the lathe is arranged on the inner wall of the chuck body, and a lifting assembly enabling the installation block to move up and down is arranged in the clamping jaw body. The chuck for the lathe is provided with the lifting assembly and the turnover mechanism, the lifting assembly can drive the workpiece body to move up and down on the upper side of the chuck for the lathe, and the turnover mechanism can drive the workpiece body to turn over on the chuck for the lathe. The turning mechanism is matched, so that the workpiece main body mounted by the chuck for the lathe can be automatically turned over and turned over, the problems that the workpiece main body needing to be machined on two sides has many turning-over procedures and consumes time and labor are solved, the working efficiency of the lathe is improved, the machi