The invention discloses a polyester yarn creeling dyeing method. The polyester yarn creeling dyeing method includes the following steps: (1) yarn loosening: selecting a loosening bobbin, loosening grey yarns, and winding the loosened grey yarns on the loosening bobbin to form a loosened yarn spool; (2) creeling, removing the loosening bobbin from the winded loosened yarn spool of the step (1), and changing the loosening bobbin into a dyeing bobbin to form a dyeing yarn spool, wherein the outer diameter of the dyeing bobbin is less than the diameter of the loosening bobbin; and, (3) dyeing: dyeing the dyeing yarn spool of the step (2). The polyester yarn creeling dyeing method can effectively solve the problem of dyeing and color quality of polyester yarns, and can ensure the production period and the production efficiency.