The invention discloses a solar ecological floating island and a water ecological restoration method, and belongs to the field of water treatment. The solar ecological floating island comprises a solar photovoltaic panel, a solar support, a solar distribution box, a storage battery, a solar controller, a solar inverter, a time controller, a power socket, an air compressor, an over-water floating platform, aquatic plants, artificial floating islands, hollow flower dishes, flower baskets, built-in plastic foams, fishing nets, biological carbon fiber water treatment fillers, aeration sand heads, silica gel soft pipes and ceramic particles, and the floating island is divided into an over-water portion, a water surface portion and an underwater portion. Electric energy is provided by the aid of a solar power supply system, automatic aeration can be achieved without external contamination, so that reoxygenation of water bodies is achieved, aerobic environments are provided for the underwater biological carbon fiber water treatment fillers, organic pollutants in polluted water bodies can be effectively reduced, nitrogen and phosphorus are removed, inhabiting and breeding places are provided for biology in the water bodies, diversities of water-body biology are richened, and in-situ restoration of the water bodies is achieved.