The present invention relates to a method for manufacturing a jellyroll-type electrode assembly, and provides a method for manufacturing an electrode assembly comprising: a notching step for forming a plurality of electrode units by notching each unidirectionally long cathode and anode into a predetermined size and shape, and notching the electrode units so as to be electrically connected to one another by a connecting unit on both ends of the electrode units; a stacking step for forming a unit cell by stacking the cathodes and anodes on one another with a separation film being a boundary; and a winding step for winding the unit cell, by bending the connecting unit so that the electrode units having the cathodes and anodes lie on top of one another. Furthermore, the present invention provides a method for manufacturing a secondary battery using the obtained electrode assembly. In manufacturing the jellyroll-type electrode assembly and polymer secondary battery, the simplification of the production process of which is easy according to the present invention, it is possible to manufacture a jellyroll-type electrode assembly and polymer secondary battery having excellent design flexibility. Furthermore, the purpose of the present invention is to provide an efficient method for processing a separation film used for manufacturing an electrode assembly so as to conform to the shape of the electrode assembly.