The present invention relates to an ecofriendly, assembly-type buoyant body which protects the marine ecosystem. More specifically, in order to allow an inner buoyant body having a buoyant layer therein and an outer buoyant body to be halved and detachably assembled to a fixed rope, the present invention: allows the inner buoyant body having a rope hole for accommodating a rope and the outer buoyant body on the outer circumferential surface of the inner buoyant body to be detachably halved has a protruding screw on one side of the inner buoyant body allows a cover having therein a screw groove into which the screw is fastened to be halved is integrally provided with the cover halved by means of a hook and a hooking groove and allows the cover to be fastened to the screw on the inner buoyant body by means of the screw groove, such that a halved buoyant body is detachably assembled to the rope. Consequently, the present invention provides the advantages of: enhancing workability by allowing only the buoyant body which has been damaged to be separated from the rope and repaired or replaced with a new one even when the rope remains wound and reducing the resulting replacement or repair cost. The present invention also provides the advantage of addressing the inconvenience of having to reconnect multiple buoyant bodies to the rope because, when a buoyant body is chafed against a tying rope for fixing the location in spite of waves or high winds and is damaged easily, thereby spoiling the aesthetics of the seashore, or is broken, replacing the damaged buoyant body conventionally required unwinding the rope fixing the entire buoyant bodies so as to separate the damaged buoyant body.La présente invention concerne un corps flottant écologique de type à assembler, qui protège lécosystème marin. De manière plus spécifique, pour permettre à un corps flottant interne ayant une couche flottante à lintérieur de ce dernier et un corps flottant externe dêtre divisés en deux et assem
