The present invention relates to an apparatus for manufacturing an electrode assembly, comprising: a lower air blowing unit for blowing air to an end of a separator sheet so that the end of the separator sheet can be bent in a height direction from the ground during a first winding; and an upper air blowing unit for blowing air to the end of the separator sheet so that the end of the separator sheet can be bent in a downward direction toward the ground of a first unit cell in a state where the first unit cell is firstly wound. Folding of the separator in a ′-′ shape can be prevented during the manufacturing process of the electrode assembly, thereby minimizing defect caused by contact between the electrodes.