Sliding rail driving mechanism

The utility model relates to a sliding rail driving mechanism which comprises a mother rail installed on an automobile bottom plate and a lead screw fixedly installed on the mother rail, a gear box penetrates through the lead screw and is driven by a motor, and a multi-stage gear transmission structure is arranged in the gear box. The worm is connected with an output shaft of a motor, the duplicate gear and the worm are in staggered shaft transmission, the middle idle gear is meshed with the duplicate gear, the output gear is meshed with the middle idle gear, a lead screw is coaxially connected with the output gear, a fixing support is arranged outside a gear box, and a rubber piece is tightly hooped between the fixing support and the gear box. The duplicate gear comprises a first gear tooth meshed with the worm and a second gear tooth meshed with the middle idle gear, and the diameter of the second gear tooth is larger than that of the first gear tooth. The transmission distance is enlarged by designing mult