An object is to arrange a movable yarn threading robot not to require a long hose for supplying compressed fluid to the yarn threading robot. In a spun yarn take-up system 1 including spun yarn take-up apparatuses 2 lined up in a predetermined direction and a yarn threading robot 3 movable in the predetermined direction and including a suction gun 37, a compressed air supply passage 7 from a compressed air supplier 5 to the suction gun 37 is divided into a system-side compressed air hose 71 extending from the compressed air supplier 5 to the spun yarn take-up apparatuses 2 and a robot-side compressed air hose 72 provided on the yarn threading robot 3, and the system-side compressed air hose 71 and the robot-side compressed air hose 72 are arranged to be attached to and detachable from each other.