The invention relates to a uniform heating plate cooling device with a support post structure and a fabrication method of the cooling device. The cooling device comprises a wind shielding plate, eddyfans and a uniform heating plate heat sink, wherein the uniform heating plate heat sink comprises a working cavity, a composite backflow structure, capillary structure support posts and a nanometer liquid-state working medium, the working cavity is formed by welding an upper cover plate and a lower cover plate, the upper cover plate is provided with rippled-shaped cooling fins, the lower cover plate is provided with heat conduction bosses, the composite backflow structure comprises upper cover plate grooves, a first silk-screen capillary liquid absorption core, lower cover plate grooves, a second silk-screen capillary liquid absorption core and support posts, the support posts are provided with capillary structures, and a plurality of through holes are formed in the first silk-screen capillary liquid absorption core and the second first silk-screen capillary liquid absorption core and are used for the support posts to penetrate through. By the support posts with the capillary structures, the backflow speed of the liquid-state working medium in the working cavity of the uniform heating plate and the heat transfer efficiency are improved, the structure strength is improved, the cooling device is applicable to an occasion where a single heat source and multiple heat sources are horizontally or vertically arranged, the application range of the uniform heat plate heat sink is expanded, and the cooling device has the characteristics of compact volume, high safety, high environmental adaptability and the like.