The invention discloses an automobile seat sliding track assembling machine and an assembling method for same. The automobile seat sliding track assembling machine comprises a base, an assembling cylinder, a cylinder rack, an outer ejector block, an inner ejector block, a right guide track, a right limiting block, an inner sliding track rack, an end stopping block, a left limiting block, a supporting block, a side sliding track rack, a left guide track, a front clamping jaw, a front connecting rod, a front clamping cylinder, a rear clamping cylinder, a rear connecting rod and a rear clamping jaw. The automobile seat sliding track assembling machine is suitable for assembling automobile seat slide tracks. By the automobile seat sliding track assembling machine, assembly operation can be finished instead of manual work, and slide track components are clamped and assembled by the different cylinders. The automobile seat sliding track assembling machine has the advantages of large output force, high assembling speed, high efficiency, high quality and the like; the labor intensity of workers is effectively reduced; and the quality uniformity of products of assembly parts is ensured. In addition, the automobile seat sliding track assembling machine is compact in structure, high in reliability, stable in operation and low in cost.