Positioning tool for steel structure

The utility model discloses a positioning tool for a steel structure, which comprises a frame body, the frame body comprises a workbench, two ends of the workbench are respectively provided with a first clamping device, a cutting device is arranged between the two groups of first clamping devices, two sides of the cutting device are respectively provided with a shielding device, and the lower side of the cutting device is provided with a negative pressure dust suction device. The steel structure is placed on the workbench, the position needing to be cut right faces the cutting knife, the two ends of the steel structure are fixed through the two first clamping devices, the two sides of the cutting device are shielded by moving the shielding device downwards, waste generated in the cutting process is prevented from flying out, the cutting device is started to cut the steel structure, and the negative pressure dust suction device is started. Waste generated during cutting is sucked and collected through the nega