The plate-fin cooler is mainly composed of the core, the heads on both sides, the connecting pipe and the mounting bracket. The core of the vacuum brazed cooler is composed of a cover plate, a partition plate, a long seal, a short seal, and inner and outer fins. The components are brazed into a whole in a vacuum brazing furnace. The baffle is the basic heat transfer surface, the fin is the secondary heat transfer surface for enhancing heat transfer, and the seal is used for sealing.