Smoke exhaust welding shed

The utility model discloses a smoke exhaust welding shed which comprises box columns and shear walls, the shear walls are installed between the box columns, the shear walls and the box columns are connected through bolts, a connecting frame is arranged on the tops of the shear walls, a fixing frame is arranged between the interiors of the shear walls, connecting columns are arranged between the fixing frame and the connecting frame, and the connecting columns are connected with the box columns through bolts. Two ends of the connecting column are respectively connected with the frame and the fixing frame through bolts; the closed system comprises a fireproof soft curtain, a riding track, a shear wall and box columns, and the riding track is located outside the shear wall; the smoke exhaust system comprises a purification device, a smoke exhaust port and a smoke suction port, the purification device is installed on the surface of the riding track, the smoke exhaust port is connected with the purification device