A cross-flow hybrid printed circuit plate heat exchanger, comprising: a top support plate, at least two sets of hot-side microchannel plates, and cold-side plate fins with microfins, and a bottom support plate, set sequentially from top to bottom, the present invention adjusts the flow direction of the hot and cold sides to be perpendicular to each other, and hot-side microchannel plates are staggered and stacked with the cold-side plate fins with microfins, and are welded using a precision diffusion welding process, and a cold test uses plate fins with microfin structures, which significantly reduces the flow pressure drop of the cold side work material while ensuring the heat exchange performance and compact structure, thus enabling the drive fan to be driven. The use of plate fins with micro-fin structure in the cold test, in order to ensure the heat transfer performance and compact structure of the premise, significantly reduce the cold side of the mass flow pressure drop, so that the power of the drive fan is greatly reduced, improving the net output power of the Brayton cycle and the mobility of the small movable reactor.
