A floating body to be connected with a water photovoltaic power generation component is characterized in that as a plastic float comprises a plurality of plastic pipelines arranged side by side and subjected to extrusion molding, joints of the plastic pipelines and plastic plates are fastened into a whole through thermofusion welding, and a plurality of reinforcing ribs are arranged on the outer walls of the plastic plates, the plastic plates and the plastic pipelines are integrally connected, and the overall supporting strength of the whole plastic float can be enhanced; as the plurality of reinforcing ribs are arranged on the outer walls of the plastic plates, the integral rigidity and strength of the plastic float are improved; as each plastic pipeline is filled with closed cell foamed plastic, when the surfaces of the plastic pipelines crack and water tries to enter the plastic pipelines, water cannot enter the plastic pipelines, accordingly, the risk that the photovoltaic power generation component sinks together with the plastic float because water enters the plastic pipelines is avoided; and meanwhile, as the plastic pipelines are filled with the closed cell foamed plastic, the rigidity of all parts of the plastic pipelines is improved, creep deformation of the plastic pipelines is reduced, and long-time shape keeping of the plastic float is facilitated.