The use of high voltage electrostatic spraying in automobile painting production lines has become more and more popular in recent years.High-voltage electrostatic spraying is beneficial to improve the paint adsorption rate and greatly improve the spraying quality.In this paper,the causes of high voltage problem and the corresponding improvement measures were simply expounded in combination with the high voltage fault of field spraying equipment,which provided some new ideas and methods for the maintenance of high voltage spraying equipment.