Flue gas cooling and condensing integrated heat exchanger

A flue gas cooling and condensing integrated heat exchanger comprises a plurality of heat exchange tube rows with fins and water distribution boxes arranged at the two ends of the tube rows. The water flow directions in all the heat exchange pipes in the lowest heat exchange pipe row are the same, the other heat exchange pipe rows are at least divided into two heat exchange pipe sets, and the heat exchange pipe sets are sequentially communicated end to end through the water distribution boxes at the two ends. The internal structures of the water distribution boxes at the two ends are different. The heat exchange tube rows are divided into an upper part and a lower part, and the distance between fins of the heat exchange tube rows of the lower part is larger than that of the fins of the heat exchange tube rows of the upper part. According to the heat exchanger, a cooling and condensing integrated structure is achieved, the structure is compact, the size is small, the heat exchange efficiency is effectively imp