A roll-roll shipment ramp device comprises: a horizontal ramp arranged at a dock and upward and downward ramps pivoted to the two ends of the horizontal ramp respectively, wherein ramp faces of the upward and downward ramps are provided with hanging points for hanging hanger ropes; a pad for crossing a cable-tying post gap is placed under the horizontal ramp and the downward ramp. The roll-roll shipment ramp device has the advantages that ship impact upon a ramp due to tide changes and marine load adjustment can be effectively buffered, the problem of allowing a hydraulic modular cart which carries and transports large-sized structures to board stably is solved, and the roll-roll shipment ramp device is reusable so that roll-roll shipment efficiency is greatly improved and roll-roll shipment cost is reduced.