The invention relates to a spraying device, in particular to an efficient lime mortar spraying device for ornamental trees and shrubs. The efficient lime mortar spraying device for ornamental trees and shrubs is novel in structure, high in spraying speed and high in spraying efficiency. In order to solve the technical problems, the efficient lime mortar spraying device for ornamental trees and shrubs comprises a base plate, a first motor, a left frame, wheels, a mounting plate, a second motor, a guide rod, a threaded rod, sprayers, a connecting rod, a rotating shaft, a first hose, a box body, a nut, an infusion pump, a second hose, a first electric drive pusher, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a second electric drive pusher, a placing plate, a fixed support, a brush block and a pushing hand. The wheels are arranged at the bottom of the base plate. The left frame and the first motor are sequentially arranged at the top of the base plate from left to right. The efficient lime mortar spraying device has the effects of being novel in structure, high in spraying speed and high in spraying efficiency.