The invention discloses an unmanned aerial vehicle used for
fruit tree spraying. The unmanned aerial vehicle used for
fruit tree spraying comprises a unmanned aerial vehicle, a camera, a
canopy relative height sensor, a front green sensor, a lower green sensor, a
wind speed sensor and a spraying device. The spraying device comprises a
servo motor, a pressure
nozzle, a
medicine chest, a supporting rod and a
medicine delivery
pipe. The method is characterized in that an unmanned aerial vehicle for surveying and mapping carries out surveying and mapping on a
orchard so that an area where fruit trees are located is calculated; through a ground controller, a
plant-protected unmanned aerial vehicle is controlled to dot each
fruit tree; the camera shoots
canopy images so as to calculate a
canopy area and a circle center position; after flying to the circle center position, the
plant-protected unmanned aerial vehicle is dropped to a position which has a h distance with a canopy; and a control module sends an instruction and the
plant-protected unmanned aerial vehicle starts to spray. In the invention, according to a density of the crown canopy, variable insecticide spraying is realized, a
pesticide application is accurate, efficiency is high and wastes of
pesticide application are avoided.