The gantry welding workbench is composed of a gantry machine cabinet, a steel plate work surface, a beam, (three-axis, fouraxis, five-axis) modules, couplings, fiber support rods, drag chains, profile brackets, columns, resonant mirror connection plates, monitor brackets, fiber line support rods, limit, and welding head connectors; the workbench's three-axis (X, Y1, Y2, Z) linkage drives the welding head to move, achieving rapid of large-area workpieces and heavy workpieces, and can complete point, straight line, circle, square, or any plane figure trajectory welding composed of straight lines and arcs. welding workbench can meet the custom requirements of cabinet size and stroke according to the product size and requirements.