The utility model provides a 220kV ultrahigh-voltage electrostatic precipitation power supply. 220kV twelve-pulse ultrahigh-voltage direct current is obtained after a six-phase twelve-pulse rectifiertransformer is connected with a three-phase rectifier bridge in series. According to the utility model, the ripple factor of the dust removal power supply is reduced, the corona power of the dust remover is improved, the dust driving speed is increased, the dust removal efficiency is improved, the pollution of low-order harmonics to a power grid is effectively reduced, and the effects of energy conservation and environmental protection are achieved.