A particle image velocimetry (PIV) was used to measure the cone-jet flow in electrostatic spray. The mode of spraying was observed. The droplets’ velocity and flow vector graphs were analyzed. Streamlines field under different voltages were obtained. The forces acted on the droplets in their transportation and the change of the velocity and flow field were analyzed. The experiment indicated that, with the increasing of voltage, the flow field was distributed uniformly and the droplets’ velocity along the axes increased with electrostatic forces, polarization forces and fluid forces together. With the increasing of axes distance, the droplets’ velocity in the same section along the radius increased under the same voltage, and the velocity uniformity in the same section improved.