The invention discloses a floating self-propelled solar energy water body purifier which can be applied to the treatment of polluted water bodies such as rivers, lakes and ponds. The floating self-propelled solar energy water body purifier comprises an umbrella-shaped casing, solar panels, a remote control device, clamping grooves, a storage battery, supports, a water pump, a water pump water outlet pipe, a water pump water suction port, an antifouling net, a water purifying system, a circular baseplate, annular buoys, water drainage pipes and control valves. According to the invention, the solar energy is taken as an energy source, and the counter-acting force generated by the drainage of the floating self-propelled solar energy water body purifier is taken as power, so that the self-sufficient, cheap, clean and convenient energy source of the overall device can be realized; through the adoption of the floating type design, the appearance is attractive, and the water body can be subjected to in-situ repairing; through the adoption of the efficient purifying system, pollutants such as nitrogen and phosphorus substances in water bodies can be removed efficiently; besides, the floating self-propelled solar energy water body purifier, provided by the invention, has the advantages of high purifying efficiency, simple structure, convenience for mounting and use, no energy consumption and the like.