The present invention relates to a belt-type automatically expandable life buoy provided to be automatically deployed when a fisherman, a sailor, a fisher, a person who enjoys leisure, an operator, and a tourist who wear the life buoy on their waist fall into the water during activities, an emergency occurs, and a sensor is in contact with water. According to the present invention, the belt-type automatically expandable life buoy comprises: a buoy with an operation unit embedded therein; and a buoy accommodation bag in which the buoy is accommodated. Furthermore, the operation unit is built in the buoy without carbon dioxide filled therein, and an outer periphery of the buoy is sealed by a sealing outer frame, wherein the operation unit accommodated in the buoy is electrically connected to a sensor box with a flow hole from the outside of the buoy by using a sensor wire, and a connecting portion of the operating unit and the sensor wire is sealed by a sealing protective tube. The buoy accommodation bag is formed into a bag with an opened upper portion as a bottom surface and both side surfaces thereof are sewn while a front plate and a rear plate are connected to each other.
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