Steam generating device of steam box

The utility model discloses a steam generating device of a steam box. According to the technical scheme, the steam generating device is characterized in that the steam generating device comprises a water heating tank, a flue gas waste heat recovery device and a steam waste heat recovery device. The water heating tank comprises a shell, the side, corresponding to the ground, of the shell sinks inwards to form a heating cavity and a flue for being communicated with the heating cavity, the other end, corresponding to the heating cavity, of the flue stretches out of the shell and is connected with the flue gas waste heat recovery device, a closed water storage cavity is formed among the flue, the heating cavity and the shell, a water inlet is formed in the lower portion of the water storage cavity, and a steam outlet is formed in the upper portion of the water storage cavity, the steam outlet is connected with the steam waste heat recovery device in a communicating mode, the flue is arranged in a bent mode, the cross section of the flue is bent into the shape of a W, and the W-shaped cross section extends to the other side of the shell from one side of the shell. The steam generating device of the steam box is large in flue heat transfer area, and can effectively use waste heat of flue gas and steam and reduce heat loss and waste.