The invention relates to an anti-drifting pneumatic atomizer capable of regulating and controlling the particle size of
fog drops on line and a control method thereof. The atomizer comprises an atomizer body and a fan-shaped atomizing cavity; the atomizer body is composed of a chemical liquid flow guide cavity, a gas flow guide cavity and an
electromagnetic flow valve; the rear part of the chemical liquid flow guide cavity is connected to the
electromagnetic flow valve; the front part of the chemical liquid flow guide cavity is provided with a fan-shaped
nozzle; the gas flow guide cavity is ahollow cone and wraps the outer side of the chemical liquid flow guide cavity; a plurality of circular gas outlets with different gas outlet angles are formed in the front part of the gas flow guide cavity and are distributed around the fan-shaped
nozzle. According to the atomizer, a pneumatic atomizing mode is adopted to carry out primary atomizing on chemical liquid by means of crossed gas flow,in addition, the gas flow and the chemical liquid flow are adjusted independently, and therefore different gas-liquid mixing ratios are dynamically achieved, and the requirements for the anti-drifting capability and the penetrating capability of the
fog drops are met; and meanwhile, the
pressure amplitude of an ultrasonic
stationary field in the fan-shaped atomizing cavity is adjusted on line, ultrasonic secondary atomizing is carried out on the
fog drops, and therefore on-line dynamic regulation and control over the particle size of the fog drops are realized, and the atomizing uniformity isimproved.