The utility model discloses a threaded connecting wire for FDM printing. The threaded connecting wire comprises internal thread holes in two ends, and a connector; the connector has the same specification as the wire, and threaded studs matched with the internal thread holes are arranged at two ends of the connector; and the two wires can be connected into a whole by the internal thread holes and the connector. By adopting the technical scheme, the FDM printing process is continuous, the production efficiency is improved, the quality of parts is ensured, waste of the wires is avoided, the wires can be completely utilized, and the production cost is reduced.