The invention discloses a sliding rail for an automotive power seat, and belongs to the technical field of automotive components. The sliding rail for the automotive power seat comprises an upper guide rail, a lower guide rail, a transmission device, a driving device and a roller stand, wherein the upper guide rail is used to be fixed with an automotive seat and has an upper guide rail cavity; the lower guide rail is used to be fixed with an automotive base plate, is matched with the upper guide rail in a sliding mode and has a lower guide rail cavity; the transmission device connected with the upper guide rail is used for making the upper guide rail move along the lower guide rail; the driving device is fixed on the automotive seat and is in transmission connection with the transmission device; and the roller stand is laid on the lower guide rail. The sliding rail for the automotive power seat has the characteristics that: the transmission device is arranged in an accommodating cavity formed by the upper guide rail cavity and the lower guide rail cavity and is shielded by the upper guide rail and the lower guide rail. Therefore, the transmission device is effectively shielded and the occupancy space is saved; and the grease used for lubricating the upper guide rail, the lower guide rail and the transmission device cannot permeate the automotive base plate and the automotive seat or even contaminate a driver or passengers.