The present invention relates to a piston lubrication system of a power sprayer configured to lubricate a piston operation without any additional lubricant (grease) and to minimize wear of the cylinder packing by forcibly supplying and circulating a part of the agent sprayed on the cylinder packing of the power sprayer More specifically, a cylinder (3) in which a compression chamber (3a) is formed is provided between a medicine suction cylinder (1) provided in a power atomizer and a medicine discharge cylinder (2) (B1) and (B2) are installed in the cylinder communicating with the cylinder through which the medicine is sucked and communicated through the compression chamber and the cylinder communicating with the discharge of the medicine through the cylinder, and the medicine is sucked in the medicine suction cylinder 1, 3a and 3b to discharge the medicament by arranging the spray nozzle on the discharge port 2a of the medicament discharge cylinder 2. The compression tank 2b and the compression tank 2b are arranged above the medicament discharge cylinder 2, By installing the pressure regulator 2c, A power sprayer for applying a constant pressure to a discharge cylinder (2) is characterized in that a packing chamber (3b) is formed on the inner peripheral surface of a piston insertion portion of a cylinder (3) The communication pipe 6 is provided so as to be connected to the discharge chamber 2d of the pressure regulator 2c provided in the pressure regulator 2 so that a part of the medicine in the discharge chamber of the pressure regulator is supplied to the packing apparatus chamber for lubrication, A part of the medicine can be circulated from the discharge chamber of the pressure regulator through the packing chamber to the medicine suction chamber by causing the medicine in the packing chamber to be recovered to the medicine suction chamber through the recovery pipe 6a, And the lubricant is lubricated by the piston of the power atomizer.본 고안은 동력분무기의 실린더 패킹에 분무기로
