A yarn winding system 1 includes an automatic winder 4 configured to wind yarn from a yarn supply bobbin to form a package, and a roving frame 2 and a spinning frame 3 each configured to perform a spinning process at a previous step for the automatic winder 4. The automatic winder 4 includes a yarn monitoring unit 45 configured to detect a state of the yarn travelling and a transmission unit 41x configured to transmit information on a monitoring result of the yarn monitoring unit 45 to the roving frame 2 and the spinning frame 3. The roving frame 2 and the spinning frame 3 include a receiving unit 21x and 31x, respectively, configured to receive the information on the monitoring result of the yarn monitoring unit 45 from the automatic winder 4.