An automatic machine for providing corrugated sheet-like elements includes elements for the continuous corrugation of a ribbon which moves in a longitudinal direction. The corrugation elements include an upper conveyor and a lower conveyor. The upper conveyor includes a plurality of upper abutment elements extended substantially transversely with respect to the longitudinal direction of motion of the ribbon. The lower conveyor includes a plurality of lower abutment elements extended substantially transversely with respect to the longitudinal direction of motion of the ribbon. The upper abutment elements are interleaved with the lower abutment elements in a work area. The upper abutment elements each include a bar adapted to make contact with the ribbon, while the lower abutment elements each include a vane, which has a substantially wedge-like transverse cross-section and is adapted to receive the ribbon in order to deform it.