PURPOSE: A low pressure spraying apparatus is provided to automatically adjust humidity and indoor temperature of a greenhouse while reducing personnel costs by automatically supplying water and agricultural chemicals in cultivating crops. CONSTITUTION: A fluid supply pipe(100) includes an inlet, a suction inlet(110), and a discharge outlet(120). The fluid stored in a fluid tank is moved according to the inlet. The fluid flowing through the suction hole is discharged through the discharge outlet to the outside. An air pressure pipe(200) includes an inlet(210) and an outlet(220) discharging the air pressure to the outside. A fluid transfer nozzle(300) transfers the fluid passing through the outlet of the fluid supply pipe to the outside. A fluid injection unit(400) sprays the fluid to the air and is connected to the outlet and the fluid transfer nozzle.
