A structure design on a double-nozzle of aerial electrostatic sprayer was introduced. Space field induced by double-nozzle and impact on size and charging of droplets from space field was analyzed. A test system from bump-nozzle-size analysis to charge-mass ratio was established. Electrostatic spray characteristics were analyzed by the experiment. It showed that when charging voltage was 10 kV, electrostatic spray could bring distributing uniformity, small droplets with the average volume middle diameter of 81.8 μm. and maximum charge to mass ratio which was 2.65 mC/kg could be obtained. Double-nozzle of aerial electrostatic sprayer is excellent such as droplets distributing uniformity and charging plenary. The nozzle is satisfied with the needs of aerial electrostatic spray.