A folding device to manufacture a stacked/folded type electrode assembly having unit cells sequentially stacked in a state in which a separation film is disposed between the respective unit cells, the folding device comprising: a web supply unit to supply a web having plate-shaped unit cells arranged at a top of a separation film (20, 40) at predetermined intervals; a winding jig to rotate the unit cells while holding a first one of the unit cells of the web so that the unit cells are sequentially stacked in a state in which the separation film is disposed between the respective unit cells; a Y-axis directional rotary shaft compensation unit to compensate for a position of a rotary shaft of the winding jig in a direction perpendicular to an advancing direction of the web, the advancing direction of the web being an X-axis direction and a direction perpendicular to the advancing direction of the web being a Y-axis direction, wherein the Y-axis directional rotary shaft compensation unit is configured to periodically change the position of the rotary shaft in the direction perpendicular to the advancing direction of the web to minimize vertical amplitude of the web during winding; an X-axis directional rotary shaft compensation unit to compensate for the position of the rotary shaft of the winding jig in the advancing direction of the web, wherein the compensation in X-axis directional position and the compensation in Y-axis directional position of the rotary shaft of the winding jig are configured to be performed simultaneously, and the X-axis directional rotary shaft compensation unit is configured to periodically change the position of the rotary shaft to compensate for the change in X-axis velocity of the web caused during winding of the plate-shaped unit cells, thereby uniformly maintaining tension of the web, and characterized in that the compensation in position of the rotary shaft of the winding jig is configured to be performed in an oval shape in which the X-axis direction is the major axis and the Y-axis direction is the minor axis during winding; wherein the Y-axis directional rotary shaft compensation unit and the X-axis directional rotary shaft compensation unit are configured to have an interconnected variable rotation structure, the interconnected variable rotation structure including a rotary eccentric roller and a variable crank. a web supply unit to supply a web having plate-shaped unit cells arranged at a top of a separation film (20, 40) at predetermined intervals; a winding jig to rotate the unit cells while holding a first one of the unit cells of the web so that the unit cells are sequentially stacked in a state in which the separation film is disposed between the respective unit cells; a Y-axis directional rotary shaft compensation unit to compensate for a position of a rotary shaft of the winding jig in a direction perpendicular to an advancing direction of the web, the advancing direction of the web being an X-axis direction and a direction perpendicular to the advancing direction of the web being a Y-axis direction, wherein the Y-axis directional rotary shaft compensation unit is configured to periodically change the position of the rotary shaft in the direction perpendicular to the advancing direction of the web to minimize vertical amplitude of the web during winding; an X-axis directional rotary shaft compensation unit to compensate for the position of the rotary shaft of the winding jig in the advancing direction of the web, wherein the compensation in X-axis directional position and the compensation in Y-axis directional position of the rotary shaft of the winding jig are configured to be performed simultaneously, and the X-axis directional rotary shaft compensation unit is configured to periodically change the position of the rotary shaft to compensate for the change in X-axis velocity of the web caused during winding of the plate-shaped unit cells, thereby uniformly maintaining tension of the web, and characterized in that the compensation in position of the rotary shaft of the winding jig is configured to be performed in an oval shape in which the X-axis direction is the major axis and the Y-axis direction is the minor axis during winding; wherein the Y-axis directional rotary shaft compensation unit and the X-axis directional rotary shaft compensation unit are configured to have an interconnected variable rotation structure, the interconnected variable rotation structure including a rotary eccentric roller and a variable crank.