Provided is a secondary battery manufacturing system for forming an electrode assembly using unit cells manufactured by laminating, and the secondary battery manufacturing system includes: a unit cell forming device for forming unit cells, in which a separator, an anode cell, a separator, a cathode cell, and a separator are stacked in order, from a separator roll, an anode cell roll, and a cathode cell roll, which are rolled; an inverting device for forming inverted unit cells, in which a separator, a cathode cell, a separator, an anode cell, and a separator are stacked in order, by inverting some of two or more unit cells formed by the unit cell forming device; and a stacking device for stacking a unit cell, an anode cell, an inverted unit cell, and a cathode cell in order, in which the process of manufacturing an electrode assembly is simplified, and the defect rate of the manufactured electrode assembly is lowered.