Rapid clamping device

The invention relates to a rapid clamping device. A cylinder is arranged at the central position of a convex projected part at a clamping butt joint of a rocker arm, two clamping pressure plates are symmetrically arranged at the upper side and the lower side of the cylinder, the large ends of the clamping pressure plates and four spherical pull rods are connected with the inner side of a side edge of the clamping butt joint, hydraulic oil enters into a large cavity of the cylinder, and a piston rod is pushed to drive a bending plate to push the clamping pressure plates, thus the clamping pressure plates tension and clamp a gap at the clamping butt joint by taking the spherical pull rods as a lever pivot and drilling machine columns and the rocker arm are eliminated; and when the hydraulic oil enters into a small cavity of the cylinder, the piston rod is pushed, thus the bending plate is loosened and is separated from the clamping pressure plates, a clamping force of a clamping butt joint is eliminated and the