More particularly, the present invention relates to a buoy using a multi-walled pipe, and more particularly, to a buoy having an inner diameter and an outer groove formed on the outer surface of the pressure- The pressure-resistant layer cover and the cover made of the ultraviolet-ray-stabilized layer cover are formed in a double structure so as to provide buoyancy without water penetration into the inside thereof, so that they are used as buoys. Even if the surface layer is broken through the multi- Friendly buoy using a multi-walled pipe that provides sufficient buoyancy even in the event of an accident, and enables recycling using environmentally friendly materials. The present invention is characterized in that an outer reinforcing layer continuously forming inner grooves and outer grooves on the outer surface of a pressure-resistant layer having a hollow on the inner surface and a rope fixing ring and a rope fixing protrusion are formed at regular intervals on the outer surface of the outer reinforcing layer A pressure-resistant layer cover having an inner rim at both ends of a body portion made of an outer diameter finished layer is projected in an arc-like shape, a reinforcing rib is formed in an inner surface in a transverse direction and a longitudinal direction, an inner rim is formed in an outer rim, And a lid part having an engaging groove formed on an outer surface of the inner rim, Wherein the body portion has a mesh reinforcing layer on an outer surface of the outer diameter finished layer and further includes an ultraviolet blocking layer on an outer surface of the mesh reinforcing layer, A support rib projecting in an arc shape on the outer side of the lid part and formed on the inner surface in the transverse direction and the longitudinal direction and located on the outer surface of the pressure-resistant layer lid； an outer rim having an outer rim formed on the outer rim, And an outer finishing lid on which a jaw is formed.본 발명은 다중벽관을 이용한 부표에 관한
