The utility model belongs to the technical field of forest
disease and
pest control, and particularly relates to a forest
disease and
pest control spraying device which comprises a straight
pipe, a
piston plate is slidably mounted in the straight
pipe, a connecting rod is mounted on the top side of the
piston plate, a
threaded rod is rotatably mounted on the bottom side of a mounting frame, and a worm gear is mounted on the outer side of the bottom end of the
threaded rod. A guide rod is mounted on the top side of the mounting frame, and a worm is mounted on the outer side of the rotating shaft; a
servo motor is started, a rotating shaft at the output end of the
servo motor drives a worm to rotate, rotation of the worm drives a worm gear to rotate, then a
threaded rod rotates, a connecting rod vertically ascends and descends along a guide rod, the connecting rod drives a
piston plate to synchronously ascend and descend in a straight
pipe, if a forest tree is high, the threaded rod drives the piston plate to ascend, the spraying coverage range of a spraying
nozzle is enlarged, and the forest tree is short; the piston plate descends, the spraying area is reduced, the spraying height is accurately adjusted, liquid
medicine is intensively sprayed to forest tree parts needing prevention and control, and waste of the liquid
medicine is reduced.