Multifunctional fixture for machining

The machining multifunctional clamp comprises a cylindrical base, an opening part is formed in the side wall of the cylindrical base, a plurality of threaded through holes are formed in the side wall of the cylindrical base, a plurality of limiting blocks are installed on the inner side wall of the cylindrical base, at least one threaded connecting hole is formed in each limiting block, and the threaded connecting holes are communicated with the opening part. A bolt penetrates through the threaded through hole and then is connected with the threaded connecting hole, the limiting block is fixed to the cylindrical base, a mounting groove communicated with the threaded connecting hole is formed in the contact face of the limiting block and a workpiece, the mounting groove is vertically formed, an elastic limiting piece is slidably mounted in the mounting groove, and the bottom face of the elastic limiting piece is connected with the mounting groove through a first spring. And the elastic limiting piece is in con