A device for harvesting long agricultural products, such as grass, straw, pulses, biomass products and the like, of the type that can be pulled by a pulling vehicle, comprises a frame (101) having a main axis of extension (A), a plurality of agricultural product harvesting elements (102), each in turn equipped with at least one long harvesting prong (103), a movement system (104) for moving each of the harvesting elements (102) along a closed trajectory surrounding the main axis of extension (A), and a plurality of bands (105) fixed to the frame (101), positioned one after another along the main axis (A) of extension and spaced out in such a way that each harvesting element (102) is at least partly interposed between two bands (105) located one after the other. The device also comprises a conveyor unit (1) comprising an elongate body (2) extending along its own axis of rotation (C) and provided with at least one peripheral step (3) forming an agricultural product feed shoulder (4) extending, along an axis which is substantially radial relative to said axis of rotation (C), between an edge (4a) proximal to the axis of rotation (C) and an edge (4b) distal from the axis of rotation.
