PURPOSE: A floating body for the plant cultivation is provided to facilitate the production of the floating body by assembling, and to enable users to directly plant plants on the floating body which floats on the surface of water. CONSTITUTION: A floating body for the plant cultivation is formed with multiple penetration holes crossing the longitudinal direction of the floating body and being separated from each other with constant intervals, and comprises a main body member(110) in a cylindrical shape which is formed with floating materials； a cover member(120) which is installed to cover every surface of the main body member, and has multiple planting holes which are respectively connected to one end of the penetration holes； a mesh net which fixes the main body member and the cover member, and covers every surface of the cover member； a water plant(200) which is planted in the penetration holes through the planting hole； multiple ring members(132) which are installed in a row by being separated from each other with constant intervals on the mesh net on the opposite side of the cover member with the planting holes； a center maintaining member which is installed on the ring members； and a first connecting member and a second connecting member(134) which are respectively installed on the mesh net. The main body member is made of foaming polyethylene or polyurethane materials. The cover member is formed by using coir felt composed of coir fibers, synthetic fiber nonwoven fabrics, or woven geotextiles. The mesh net is formed by using a synthetic resin net, a wire mesh, or a geogrid net. The center maintaining member is composed of a metal chain or a material with certain weight. The floating body for the plant cultivation has one end connected to the first connecting member and the second connecting member, and the other end connected to a fixing block which is installed on the underwater ground or on the ground of land. A supporting member is formed using one of a w
