A foldaway security shutter (1) is described, comprising a plurality of transverse elements (2) articulated together by means of connecting-rods (3) pivoted at the ends (4) of said transverse elements (2), two lateral uprights (6) within which the ends (4) of the transverse elements (2) and the connecting-rods (3) slide between a closed position in which said transverse elements (2) extend along the uprights (6) and an open position in which the transverse elements (2) are gathered in an upper box (8), and operating means (7) for the transverse elements (2). Said operating means (7) are equipped with a toothed wheel (9) operated by an electric motor (17), suitable for engaging the internal teeth (10) of rack connecting-rods (3), causing the upward or downward movement of the transverse elements (2).