Clamping device

The utility model discloses a clamping device. The method is characterized in that the method is characterized by comprising the following steps; the clamping device comprises a mounting plate, a pushing mechanism and four sets of clamping plates. The four groups of clamping plates are annularly and uniformly distributed below the bottom surface of the mounting plate; the tops of the clamping plates are arranged on the mounting plate in a sliding mode, the pushing mechanism is mounted on the top face of the mounting plate, the pushing mechanism is connected with the tops of the four sets of clamping plates, and the pushing mechanism pushes the four sets of clamping plates to synchronously get close to each other or get away from each other. Four groups of strip-shaped through grooves are annularly and uniformly distributed in the mounting plate; the strip-shaped through grooves are formed right opposite to the centers of the installation plates, two sets of sliding rails are arranged on the portions, on the t