Method and device for conveying and erecting boxes (4), made of cardboard or the like, according to which each box (4) is withdrawn in an initial flattened configuration, in which it is arranged in two overlapped layers (11, 12), by at least one picking up member (29, 40), which engages the box (4) on its wall (5, 6) and moves the box (4) first through an erecting station (14), in which the layers (11, 12) are moved far from each other, to give to the box (4) a final, erected configuration with two open ends (7), and then, through at least one closing station, in which one of the open ends (7) are closed.