Workpiece clamping device of gantry machining center

The utility model relates to a gantry machining center workpiece clamping device which comprises an adjusting plate, two sliding grooves are symmetrically formed in the adjusting plate, and locking structures are arranged on the outer sides of the sliding grooves. The locking structure comprises a control lead screw, a moving block, a connecting notch, a rotating rod, a fastening lead screw, an adjusting nut, a connecting block and a fixing plate. The interiors of the sliding grooves are rotationally connected with control lead screws, the outer sides of the control lead screws are in threaded connection with moving blocks, and the moving blocks are in sliding connection with the interiors of the corresponding sliding grooves. A workpiece can be fixed in the vertical direction by arranging the locking structure, the moving block can be controlled to move by controlling the lead screw, so that the moving block drives the two different rotating rods to move, the rotating rods are arranged to be rotatable, and t