The conveying device comprises an outer sheath tube, a multi-cavity tube and an inner
catheter, the multi-cavity tube is provided with a fixing cavity and a guiding cavity which are axially through, the multi-cavity tube comprises a main body section and a reducing section located at the far end of the main body section, and the
diameter of the reducing section is smaller than that of the main body section; a containing gap is formed between the outer wall of the reducing section and the inner wall of the outer sheath tube, the inner
catheter is connected into the fixing cavity in a sleeved mode and is relatively fixed to the multi-cavity tube, the far end of the inner
catheter extends out of the far end of the multi-cavity tube, and the multi-cavity tube and the inner catheter are movably arranged in an inner cavity of the outer sheath tube in the axial direction of the outer sheath tube at the same time. According to the conveying device and the
stent system, the inflection section formed when the
branch sheath controls the guide wire to be inflected is contained in the containing gap, under the condition that the
diameter of the multi-cavity tube is not reduced, the
maximum diameter of the outer sheath tube can be effectively reduced, wounds are reduced, the conveying device and the
stent system are suitable for more patients, and the indication range is expanded; and a doctor is more convenient to use and simpler to operate during an operation.