Abstract: The combination of electrostatic spray and spray bar sprayer is an efficient plant protection technology.The spray bar type electrostatic sprayer needs to arrange multiple electrostatic nozzles to work at the same time when spraying.There will be interference between the nozzle atomization areas and affect the static electricity.The nozzle charging stability and atomization uniformity.In order to explore the stability and uniformity of multi-nozzle electrostatic spray,the Fluent software was used to simulate and analyze the internal flow field of airflow auxiliary components with different structures,and the best structure was selected to improve the electrostatic nozzle,with droplet charge-to-mass ratio and droplet deposition.The volume variation coefficient and the number of droplets deposited on the target are the test indicators.The charging stability and the uniformity of the fog amount distribution are tested when multiple electrostatic nozzles are operated at the same time.Research shows that the improved electrostatic nozzle can improve the charging stability,the uniformity of the horizontal distribution of the mist and the uniformity of the space distribution of the mist.The atomization effect is the best when the nozzle spacing is 250mm and the charging voltage is 6kV.Under this condition,the improved electrostatic nozzle ratio.The droplet charge-to-mass ratio of the original electrostatic nozzle was increased by 19.0%,the coefficient of variation of the horizontal distribution of the fog volume was reduced by 16.5%,and the number of fog droplets deposited on the front of the upper,middle and lower sampling layers increased by 14.0%,17.9%and 24.5%.The number of droplets deposited on the back side increased by 36.8%,88.9%and 240.0%respectively.This research can provide a theoretical basis for the optimal design of the spray bar electrostatic sprayer.