The invention discloses an electric lumbar support driver. The electric lumbar support driver comprises a shell and an end cover, wherein the shell and the end cover are combined into a box body, and an outlet line is formed on the box body. The electric lumbar support driver is characterized in that a worm gear, a fixed gear ring, an external gear, a drive disc and an inhaul cable disc are arranged in the box body, the worm gear rotates by virtue of worm drive, a worm is driven by a power source, an eccentric shaft is arranged on the worm gear, the external gear is arranged on the eccentric shaft, a drive pin is arranged on the external gear, the fixed gear ring is fixedly arranged in the box body and is arranged outside the external gear to be eccentrically meshed with the external gear, the drive disc is arranged on the external gear, a first driving groove and a second driving groove are formed in the drive disc, the first driving groove is matched with the drive pin, the inhaul cable disc is rotatably arranged above the drive disc, a driving column is accordingly arranged on the inhaul cable disc, and the driving column is matched with the second driving groove. The electric lumbar support driver disclosed by the invention adopts stacked multi-drive, a large drive ratio is realized, the overall stability is better, and the service life is longer.