Compound clamping mechanism of machine tool

The invention discloses a compound clamping mechanism of a machine tool, which belongs to the field of machine tool fixtures. The compound clamping mechanism of the machine tool comprises a sliding rail, a large adjusting screw rod, a moving block, a large clamping block, a small adjusting screw rod, a fixed block and a small clamping block, wherein the upper end of the sliding rail is clamped on a flange at the lower end of the moving block; the large adjusting screw rod is engaged with the moving block; the lower end of the small clamping block is embedded into a dovetail groove at the lower end of a groove of the large clamping block; the small adjusting screw rod is engaged with the fixed block; one end of the small adjusting screw rod is fixedly connected with the small clamping block. The compound clamping mechanism of the machine tool solves the problems that according to the existing clamping mechanism, the labor intensity is large, the auxiliary time for parts processing is long, the universality is low due to a special fixture, and the like, and has the advantages of simple structure, reasonable design, and easiness in manufacturing.