PURPOSE: To obtain the liquid-spraying device capable of being applied to a large scale green house in the state of the small spraying device and capable of spraying a chemical agent on plural culture crops in the green house with the single device.

CONSTITUTION: The liquid-spraying device for spraying a liquid on culture crops 3 planted in plural rows 2 in the green house is provided with a pair of rails 5, 5 disposed on the mutually faced side walls of the green house 1, a beam 6 supported between the rails 5, 5 and capable of reciprocatively moving along the rails 5, a beam-moving means for moving the beam 6, a nozzle unit 7 supported on the beam 6, capable of being reciprocatively moved along the beam 6, and having a nozzle for spraying the liquid on the culture crops 3, and a nozzle unit-moving means for moving the nozzle unit 7.