Countercurrent phase change water-cooling heat exchanger

The utility model discloses a countercurrent phase change water-cooling heat exchanger, and relates to the technical field of heat exchangers. The heat exchanger comprises fins, the number of the fins is at least two, and a channel is formed between every two adjacent fins. The connecting plates are arranged at the two ends of each fin, and the two ends of each connecting plate are connected with the two adjacent fins correspondingly; the number of the water pipes is multiple, each water pipe penetrates through at least two fins, and all the water pipes are communicated; the number of the phase change pipes is multiple, at least one phase change pipe is arranged between any two adjacent water pipes in the height direction of the fins, each phase change pipe penetrates through at least two fins, all the phase change pipes are communicated, and the phase change pipes are filled with refrigerants; the first fan is mounted on the side walls of the fins; the top of each connecting plate is provided with a through