Fast clamping mechanism of machine tool

The invention discloses a fast clamping mechanism of a machine tool, and belongs to the field of machine tool clamps. The fast clamping mechanism comprises a sliding rail, an adjusting screw rod, a movable block and a clamping block, wherein the upper end of the sliding rail is clamped on the concave edge of the lower end of the movable block, the lower end of the clamping block is pressed on a concave edge of the upper end of the movable block, and the adjusting screw rod is meshed with the movable block. The fast clamping mechanism solves the problems that an existing machine tool clamping mechanism is long in clamping face moving time, large in labor intensity and low in work efficiency, and has the advantages of being simple in structure, reasonable in design and easy to manufacture.