PURPOSE: To independently control the characteristic variables of spraying streams by opening spraying air ejection channels at the frontal face, making entrainment air ejection channels independent from other air ejection channels and supplying the compressed air of the pressure different from the pressure of the air supplied to the other air ejection channels to these entrainment air ejection channels.

CONSTITUTION: This device is provided with a liquid ejection channel 30 which is formed at the center of a spraying nozzle 16, a spraying liquid flow straightening air ejection channel 40, the spraying air ejection channels 39 and at least one entrainment air ejection channel 38 which is disposed coaxial and parallel with the liquid ejection channel 30 and open at the frontal face of the spraying nozzle 16 to which the liquid ejection channel 30 opens. The spraying air ejection channels 39 open at the front face described above and at least one entrainment air ejection channel 38 is independent from the other air ejection channels and are supplied with the compressed air of the pressure different from the pressure of the air supplied to the other air ejection channels. Consequently, the respective relative independent control of the main characteristic parameters of the spraying streams is made possible.