Agricultural pesticide spraying unmanned aerial vehicle for hilly areas and control method of agricultural pesticide spraying unmanned aerial vehicle

The agricultural pesticide spraying unmanned aerial vehicle comprises a round fuselage, a propeller mechanism, a battery pack and a controller are installed at the top of the round fuselage, the bottom face of the round fuselage is connected with a mounting plate through four annularly-arranged first air cylinders, and four sets of air injection mechanisms are arranged on the side face of the round fuselage; the air injection mechanism and the first air cylinder are alternately arranged, the air injection mechanism comprises a horizontal air injection hole, an upward-inclined air injection hole and a downward-inclined air injection hole, an air pump and a compressed air storage tank are installed at the top of the mounting plate, a liquid storage tank is installed at the bottom of the mounting plate, an electric control sprayer is installed at the bottom of the liquid storage tank, and a second air cylinder is installed at the top of the mounting plate; the piston end of the second air cylinder penetrates thr