A folding assembly (10) of a continuous sheet (F) of packaging material, in particular paper, applicable to automatic packaging machines (100) of the type comprising a sliding plane (101) for conveying a continuous sheet (F) of packaging material, in particular paper, along a conveying direction (DT), said sliding plane (101) comprising an entrance end (102) for entering the continuous sheet of paper (F) and two opposite sides (103, 104) parallel to the conveying direction (DT), and a feeding assembly (105) for feeding the continuous sheet (F) of packaging material along a feeding plane (106) which is orthogonal or substantially orthogonal to the conveying direction (DT) and defined at the entrance end (102) of the sliding plane (101), in which the continuous sheet (F) of packaging material is fed along the feeding plane (106) according to a feeding direction (DA) orthogonal or substantially orthogonal to the sliding plane (101) and is deviated of a right or a substantially right angle while passing from the
