The invention relates to an equipotential mask capacitor type voltage transformer. The equipotential mask capacitor type voltage transformer comprises a capacitor voltage divider and an electromagnetic unit. The electromagnetic unit comprises a compensation electric reactor that is connected with the output end of the capacitor voltage divider, and an intermediate transformer whose primary winding is connected with the compensation electric reactor. The secondary winding of the intermediate transformer comprises a main secondary winding and a surplus winding. The surplus winding is connected in parallel with an iron magnetic resonance damper. In the equipotential mask capacitor type voltage transformer, the iron magnetic resonance damper is able to inhibit the overvoltage of iron magnetic resonance effectively, and is able to improve the transient response property of the iron magnetic resonance damper greatly.