The invention relates to a cool-heat exchanger, in particular to a cool-heat exchanger which carries out cool-heat exchange through natural circulation and a manufacturing method. The cool-heat exchanger comprises a plurality of U-shaped pipes which are filled with cool-heat exchange media, and a plurality of the U-shaped pipes are communicated through a plurality of connecting pipes, wherein theport of a U-shaped pipe is connected with a cool-heat exchange medium filling pipe, and the outer walls of a plurality of the U-shaped pipes are provided with a partition board passed through by a plurality of the U-shaped pipes and a plurality of radiating fins. One side of the partition board of the cool-heat exchanger is arranged in a high-temperature area, while the other side of the partition board of the cool-heat exchanger is arranged in a low-temperature area. The cool-heat exchanger has simple structure and production process, small volume, good heat transfer effect and good temperature homogeneity. The invention maximizes the heat exchange area of the cool-heat exchanger under the condition of the same volume.