The high-voltage package and voltage doubler module of the electrostatic spray gun are the core boosting and consumable accessories of the electrostatic powder spray gun. It relies on resistors, capacitors, and coils to build a multi-stage cascade boost circuit to convert low-voltage electrical energy into tens of thousands of volts of high-voltage static electricity, which supplies power to the discharge needle of the spray gun, allowing the powder coating to be charged and adsorbed on the surface of the metal workpiece to complete the electrostatic spraying operation.