A capacitor voltage transformer includes a capacitor voltage divider and an electromagnetic unit concentrically connected in series. The capacitor voltage divider is composed of a top voltage sharing shade and a tandem three-layer ganged condenser connected in series. The electromagnetic unit includes a compensation electric reactor, an intermediate transformer and a quick saturation damping reactor. The three-layer ganged condenser is provided with, from inside out, a main capacitor (1), an inner layer shielding auxiliary capacitor (5), an inner annular shielding electrode (4), an outer layer shielding auxiliary capacitor (3), a composite insulation sleeve (7) and an outer layer annular shielding electrode (2). The voltage transformer provided by the invention is high in voltage measurement precision and high in response speed, and meet requirements for accurate measurement of working frequency alternating voltage of power grids of super high voltage level to extreme high voltage level. The voltage sharing device used for measurement is in a good shielding state and is insusceptible to stray parameters. The voltage sharing ratio is stable and the measurement precision is high. The capacitor voltage transformer provided by the invention can be used as a standard voltage transformer.