The invention relates to a solar agricultural spraying unmanned aerial vehicle. The solar agricultural spraying unmanned aerial vehicle comprises an unmanned aerial vehicle main body, a control chip, a battery, a propeller, a converter, a solar cell panel bracket, a solar cell panel, a fixed rib plate, a direction control propeller, a signal transceiver, a spraying opening, a water pipe I, a fixed plate, a water pump, a water pipe II, a water tank, a bracket and a pesticide adding opening, wherein the solar panel is a dye-sensitized solar cell; and a photo-anode of the dye-sensitized solar cell comprises an absorbing layer I, a scattering layer and an absorbing layer II which are arranged on the surface of a conductive substrate in sequence. The solar agricultural spraying unmanned aerial vehicle can absorb light energy and convert the light energy into electric energy to use so that electric energy is saved.