Box concentric positioning clamp

The utility model relates to the field of box machining and clamping, in particular to a box concentric positioning clamp which comprises a bottom plate, a plurality of clamping assemblies are arranged on the bottom plate and connected to the outer side of the bottom plate, and the box concentric positioning clamp is characterized in that a first positioning groove and a second positioning groove are formed in the bottom plate; the first positioning groove and the second positioning groove are coaxial, and the first positioning groove is located on the inner side of the second positioning groove. In the workpiece machining process, firstly, a workpiece is positively installed, at the moment, the first positioning groove is used for positioning the workpiece, and the clamping assembly is used for clamping and fixing the workpiece to the position above the bottom plate for machining; and then, the workpiece is inversely mounted, at the moment, the second positioning groove is used for positioning the workpiece,