Heat exchanger and heat management system

The invention relates to a heat exchanger and a heat management system, the heat exchanger comprises a drainage plate arranged in a cold flow channel layer, a plurality of first drainage grooves are formed in the drainage plate, and the adjacent first drainage grooves are arranged at intervals and form a plurality of flow dividing gaps. The first drainage groove is independently formed by one of straight groove sections and curved groove sections or formed by alternately arranging the straight groove sections and the curved groove sections, the side wall of each curved groove section is in a curve shape extending smoothly, the center line of each straight groove section is in a straight line shape, and the center line of each curved groove section is in a straight line shape; each straight groove section comprises a plurality of staggered channels which are sequentially communicated along the center line of the straight groove section, and the adjacent staggered channels are arranged in a staggered mode in th