The invention relates to a voltage divider unit used for a voltage transformer, and a capacitor element and a resistor element thereof. The voltage divider unit comprises a capacitor element and at least two resistor elements. Insulating fins are disposed on the capacitor element and/or the resistor elements and are used for not only dissipating heat, but also simultaneously increasing creep distance. Additionally, the insulating fins resolve a problem of current leakage caused by poor stability, a short service life, and partial discharge arising from the resistor/capacitor elements so as to increase the measuring precision of the voltage transformer.