The present invention relates to a buoy providing buoyancy for drifting in the ocean; A mooring rope connected to a lower portion of the buoy to control movement of the buoy; At least one sensor module attached to a predetermined position of the mooring rope to observe the marine environment; A fixed unit connected to the mooring rope to fix the part and the sensor module through the mooring rope and to supply power to the sensor module; And a controller installed inside the buoy, connected to the sensor module to control operation of the sensor module, and collecting and storing data observed by the sensor module, wherein the sensor module is made waterproof Water and foreign substances are blocked from entering and exiting, In measuring underwater marine environment using buoys, each of the observation sensors is mounted by using a waterproof member while buoyancy or self weight is given, To protect each of the observation sensors.
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