The device (100), associated to a packaging machine, includes a conveyor formed by belts (3, 4) which face each other along a section (K). The belts (3, 4) convey the leaflet (1) from a creasing station (30), in which a crease (1a) is made, to a first and second folding stations (40, 50), in which an external part (10) delimited by the line (1a) is folded upwards until it assumes vertical position and then it is folded again over the remaining part of the leaflet (1). In a following pressing station (60), the folded shape (R) of the leaflet (1) is stabilised, and in an outlet station (70), the leaflet (1) is transferred to a second conveyor (8), perpendicular to the first conveyor (2).
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