Flue gas waste heat recovery device

The utility model discloses a flue gas waste heat recovery device, and belongs to the technical field of flue gas waste heat recovery equipment. The method is characterized in that the method is characterized by comprising the following steps; the heat exchanger comprises a heat exchange tank body (1), a heat exchange unit and a partition plate (2), the partition plate (2) is horizontally placed in the heat exchange tank body (1) and divides the heat exchange tank body (1) into a smoke cavity (3) and a water tank (4). A plurality of heat exchange units are vertically arranged on the partitionplate (2), one end of each heat exchange unit extends into the smoke cavity (3), the other end of each heat exchange unit extends into the water tank (4), a water side partition plate (6) is vertically arranged in the water tank (4) and connected with the inner wall of the heat exchange tank (1) and the partition plate (2), and the horizontal section of the water side partition plate (6) is spiral. A spiral channel formed