Welding slag collecting device capable of being folded and stored

The utility model discloses a welding slag collecting device capable of being folded and stored. The welding slag collecting device comprises a first collecting hopper, a second collecting hopper, a connecting hopper and a supporting mechanism. A first rotating shaft and a second rotating shaft which are parallel are fixedly arranged at two ends of the bottom surface of the connecting hopper; a first shaft hole and a second shaft hole which are matched are respectively formed in the bottom surface ends of the first collecting hopper and the second collecting hopper; the supporting mechanism comprises a first supporting arm, a second supporting arm, a locking bolt and a locking nut matched with the locking bolt. One end of the first support arm and one end of the second support arm are matched and connected through a locking bolt and a locking nut; the other ends of the first support arm and the second support arm are respectively hinged with the bottom surfaces of the first collecting hopper and the second co