NOVELTY - The device comprises a charging valve body and a floating island bearing plate, where the charging valve body comprises a semi-cylindrical modularized floating body. The floating body is fixed on the floating island bearing plate via a lock catch and is provided with a screw thread hole, where one side of the lock catch is provided with a square fixing head and other side is provided with a screw thread. A one side edge of the floating island bearing plate is provided with a valve body groove. The lock catch passes through the valve body groove.    USE - Ecological floating island device    ADVANTAGE - The ecological floating island device is simple in design structure, formed by jointing independent units, light in volume, easy to transport, very convenient to assemble and maintain, and low in investment and running costs.    DETAILED DESCRIPTION - The device comprises a charging valve body and a floating island bearing plate, where the charging valve body comprises a semi-cylindrical modularized floating body, which is made of carbon fiber and high heat toughening material including PVC material. The floating body is fixed on the floating island bearing plate via a lock catch and provided with a screw thread hole, where one side of the lock catch is provided with a square fixing head and other side is provided with a screw thread. A one side edge of the floating island bearing plate is provided with a valve body groove. The lock catch passes through the valve body groove. The modularized floating body and the island bearing plate are fixedly connected with each other via the screw thread hole. The modularized floating body is provided with a charging and discharging part of the valve body. The floating island bearing plate has a density of greater than 1 g/cm3 of a plastic plate, and is provided with a planting cup, where the planting cup is provided with a planting cup hole and includes agricultural solid waste and rice straw as raw material, which is crushed and added with adhesive, curing agent, waterproof agent and then uniformly mixed and heat pressed. The floating island bearing plate is arranged on microbial inoculant release box comprising photosynthetic bacteria, actinomycetes, saccharomycetes, pseudomonas lactic acid bacteria, Bacillus, nitrobacteria, nitrite bacteria and/or denitrifying bacteria. The bearing plate is provided with biological filling material and arranged on a wind-light complementary power generation system connected with a charging pump. The power generation system comprises a solar photovoltaic panel, a wind driven generator, a storage battery, a charging/discharging controller. An output circuit of the solar photovoltaic panel and the wind power generator is respectively connected with the storage battery and the charging pump by the control circuit of the charging and discharging controller.