Due to the limited length of the working surface of machine tools such as milling machines and boring machines, when machining some long cylindrical and flat workpieces, a part of the workpiece is suspended outside the workbench, which is easy to damage the machine tool and affect the machining accuracy, and does not conform to civilized production. To this end, it is necessary to have a trolley bracket that can be moved up and down, left and right, and back and forth by a random bed table.