System for the production of panels, particularly for the production of panels made of wood flakes, comprising: at least a support plane movable along a direction of forward movement; at least a first and a second forming machine (3a, 3b) comprise at least a collecting vessel able to receive a flow of wooden material (6, 7) and conveying means (13, 14) able to send said flow of wooden material (6, 7) towards distributor elements, said forming machines (3a, 3b) being arranged in succession to one another along said direction of forward movement above said support plane and each comprising at least a first set of distributor elements rotatable around respective axes, said distributor elements being able to select said flow of wooden material (6, 7) comprising short flakes and long flakes; wherein said first forming machine and said second forming machine comprise at least a second set of distributor elements operable independently of the relative first set and by the fact that the distributor elements of said first set are operable in rotation in both ways, wherein said distributor elements comprise elements spaced apart according to the length of reference of said long flakes for which the selection is to be made so as to allow the short flakes to cross said distributor elements and to fall on said support plane, and the long flakes to be dragged over said distributor elements and, before falling onto said support plane, to be advanced to the end of said set of distributor elements; and wherein at least one of said forming machines (3a, 3b) comprises at least a collecting vessel able to receive said flow of material (6, 7) and conveying means (13, 14) able to send said flow of material (6, 7) towards said distributor elements, characterized by the fact that said conveying means (13, 14) comprise at least a partition element able to deflect said flow of material (6, 7) towards at least one of said first and second sets (5a, 5b), where said partition element is hinged on a fulcrum to the collecting vessel and its position is adjustable in a discrete or continuous way depending on where the flow of material (6, 7) is to be conveyed, the partition element being fixed inside of said collecting vessel and being hinged on said fulcrum along the entire width of said forming machine (3a, 3b) so as to direct the fall of the flow of material (6, 7) inside the forming machine, removable fixing means are provided able to block the angular position of said partition element according to the process, type and size parameters of the wooden material. at least a support plane movable along a direction of forward movement; at least a first and a second forming machine (3a, 3b) comprise at least a collecting vessel able to receive a flow of wooden material (6, 7) and conveying means (13, 14) able to send said flow of wooden material (6, 7) towards distributor elements, said forming machines (3a, 3b) being arranged in succession to one another along said direction of forward movement above said support plane and each comprising at least a first set of distributor elements rotatable around respective axes, said distributor elements being able to select said flow of wooden material (6, 7) comprising short flakes and long flakes; wherein said first forming machine and said second forming machine comprise at least a second set of distributor elements operable independently of the relative first set and by the fact that the distributor elements of said first set are operable in rotation in both ways, wherein said distributor elements comprise elements spaced apart according to the length of reference of said long flakes for which the selection is to be made so as to allow the short flakes to cross said distributor elements and to fall on said support plane, and the long flakes to be dragged over said distributor elements and, before falling onto said support plane, to be advanced to the end of said set of distributor elements; the short flakes to cross said distributor elements and to fall on said support plane, and the long flakes to be dragged over said distributor elements and, before falling onto said support plane, to be advanced to the end of said set of distributor elements; and wherein at least one of said forming machines (3a, 3b) comprises at least a collecting vessel able to receive said flow of material (6, 7) and conveying means (13, 14) able to send said flow of material (6, 7) towards said distributor elements, characterized by the fact that said conveying means (13, 14) comprise at least a partition element able to deflect said flow of material (6, 7) towards at least one of said first and second sets (5a, 5b), where said partition element is hinged on a fulcrum to the collecting vessel and its position is adjustable in a discrete or continuous way depending on where the flow of material (6, 7) is to be conveyed, the partition element being fixed inside of said collecting vessel and being hinged on said fulcrum along the entire width of said forming machine (3a, 3b) so as to direct the fall of the flow of material (6, 7) inside the forming machine, removable fixing means are provided able to block the angular position of said partition element according to the process, type and size parameters of the wooden material.