The invention relates to an automobile sliding door transmission mechanism. An outward-opening rocker and an outward-opening push plate are hinged to the outer side face of an installation plate, and the lower end of the outward-opening rocker is connected with a connector on the outer side edge of the outward-opening push plate through an outward-opening transmission plate. A rear lock opening arm is hinged to the installation plate and provided with a rear lock opening pin, a rear lock opening hook is arranged on the outer side edge of the outward-opening push plate, and the outward-opening push plate drives the rear lock opening arm to rotate when rotating. A lower lock opening arm is hinged to the installation plate and provided with a lower lock opening pin, a lower lock opening bayonet is arranged on the side edge of the outward-opening rocker, and the outward-opening rocker drives a lower lock opening arm to rotate when rotating. An inward-opening rocker is hinged to the installation plate and is connected with the outward-opening push plate through a linkage mechanism capable of being opened and closed. The mechanism is simple in structure and low in weight, can achieve the inward and outward opening function, unlocking and locking functions, the electric opening function and the child protection lock function of an electric door lock, and can meet the use requirement of sliding doors of automobiles of most types.