An IoT-based smart safety protection device and a field management service providing system using the same are provided, and the amount of string transversely crossing the chest of the human body among at least one string formed to cover at least one part of the human body A smart seat belt and smart seat belt including a heart rate sensor provided on the stage and a transmission module for outputting the heart rate output from the heart rate sensor through IoT-based wireless communication and a channel to be linked through IoT (Internet of Things)-based wireless communication A wireless communication module for forming a wireless communication module, an information input/output module including at least one sensor for sensing the surrounding environment, an image lighting module for photographing the front and irradiating light toward the front, a fastening located in the center of a string covering both sides and lower sides of the face A smart comprising a control module for analyzing and processing a first fit sensor for detecting whether the means is fastened, heart rate output from the smart seat belt, detection data output from the information input/output module, and the first fit sensor for detecting whether the first fit sensor is fastened Includes hard hat.
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