The invention relates to an electric desalting and dewatering system and method for coal tar, relates to the technical field of coal tar treatment and is intended to conveniently meet coal tar desalting and dewatering processes. A technical scheme mainly used herein is characterized in that the electric desalting and dewatering system and method for coal tar comprises an emulsifying and demulsifying device, a first electric desalting and dewatering device, and a second electric desalting and dewatering device; the first electric desalting and dewatering device comprises a first electric desalting and a first oil-water separator; the second electric desalting and dewatering device comprises a second electric desalting tank, and a second oil-water separator. Compared with the prior art, the system and method allow one batch of coal bar to be desalted and dewatered is first classified according to densities, and employ different treating processes according to the different types of coal bar.