The present invention provides a system for preventing a bad smell. More specifically, the present invention relates to a smart system for eco-friendly natural circulation for preventing a bad smell and energy self-reliance based on IoT, which is applied to a garbage dump or a compost place to remove a bad smell discharged to the outside, and can construct a self-reliance establishment with energy self-reliance. According to an embodiment of the present invention, the smart system for eco-friendly natural circulation for preventing a bad smell and energy self-reliance based on IoT can be applied to a normal garbage dump, and can continuously remove ammonia gas collected by inputting a bad smell removing agent formed by mixing moisture and organic acid after collecting the ammonia gas generated in a dry chamber as a bad smell removing section is installed on a slope of a roof of conventional and new fertilizer establishments.
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