The invention relates to a device for accurately spraying wood disorder medicine strip, which belongs to the field of automatic measure and control of agroforestry machinery and equipment, and comprises a mobile platform, a main control unit, a laser scanned radar, a ring-shaped spraying manipulator and a spraying subsystem, wherein the laser scanned radar is fixed on the front portion of one side of the mobile platform, and is faced to a target trunk, the ring-shaped spraying manipulator is arranged on the same side of the rear portion of the mobile platform and the laser scanned radar, and comprises a rotating part, a lifting part, a feeding part, an arm part and a paw. The device for accurately spraying the wood disorder medicine strip can achieve to accurately spray medicine in a ring shape according to the situation of each tree truck during the process that a vehicle marches forward on one side of the truck, sprays a ring-shaped closed disorder medicine strip with a certain width in a close range and small range of the truck to block defoliators, can greatly saves dose, improves pesticide use rate, reduces environment pollution, further can liberate labor force, and improves production efficiency.