A yarn winding system 1 includes: a spinning frame 3 configured to form a yarn supply bobbin 11; and an automatic winder 4 configured to wind yarn from the yarn supply bobbin 11 to form a package. The spinning frame 3 includes: control device 31 configured to generate spinning information including information on at least one of a processing status of forming the yarn supply bobbin 11 and a condition for completing spinning of the yarn supply bobbin 11; and a transmission unit 31c configured to transmit the spinning information to the automatic winder 4. The automatic winder 4 includes: a receiving unit 41c configured to receive the spinning information; and a control device 41 configured to control operation of the automatic winder 4 (each of winder units 42 and a bobbin preparation device 7) based on the spinning information received by the receiving unit 41c.