The present invention relates to an eco-friendly system for generating a bio gas in high concentration and treating fermentation remnants using livestock excretions, and more particularly, to a system which generates electricity using high temperature methane gas generated by anaerobically fermenting livestock excretions and which makes all the digestive fluid remaining after the fermentation into sludge without separating solids and liquid from each other to produce high caloric charcoals which can be used as fertilizer. For this, the eco-friendly system includes: an excretion throwing part; a preheating part for preheating the excretion thrown through the excretion throwing part; a high temperature fermentation part in which a tank storing the preheated excretions is partitioned by a partitioning wall to ferment the excretions at a high temperature while circulating the excretions; a moisture removal and desulfurization part for liquefying vapor generated during the fermentation of the excretions to remove the vapor and desulfurize hydrogen sulfide; a gas storage part for collecting a methane gas and a carbon dioxide gas to store the collected methane and carbon dioxide gases; a power generation part for combusting the methane gas to generate electricity; a digestive fluid storage part for storing overflowing digestive fluid; a sludge part for processing the digestive fluid into digestive fluid sludge; a carbonization part for carbonizing the digestive fluid sludge to produce high caloric charcoals and composts; and a boiler heating device for utilizing waste heat remaining after the heat is used for generating the electricity.
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