The invention discloses a yarn storage disc polishing device. The yarn storage disc polishing device comprises a polishing wheel, a movable platform, a mounting main shaft, a driving device and a balancing weight, wherein the polishing wheel is arranged on a rack; the mounting main shaft is mounted on the movable platform; and the driving device is mounted on the movable platform and used for driving the mounting main shaft to rotate and can control the rotation angle. The driving device comprises a rotating shaft, a transmission gear, a gear rack and a driving air cylinder, wherein the rotating shaft is connected with the mounting main shaft and is coaxial with the mounting main shaft; the gear rack is engaged with the transmission gear; and the driving air cylinder drives the gear rack to act. The movement value generated after the driving air cylinder completes an extending stroke or return stroke and drives the gear rack to move serves as a definite value. The rotation arc length,corresponding to the definite value, of a yarn storage disc equals to the cambered surface arc length of the yarn storage disc. The yarn storage disc polishing device further comprises a quick clamp,a locating device and a push-pull device, wherein the quick clamp is arranged on the movable platform; the locating device is used for making a thread outlet of the yarn storage disc be aligned with the polishing wheel; and the push-pull device is connected with the movable platform. The yarn storage disc polishing device is simple in structure, convenient to operate, low in cost, good in polishing effect, precision in location, low in error rate and high in production efficiency.