A fishing line spool holder for facilitating the transfer of fishing line from a supply spool to a fishing reel. The spool holder is adapted to mount to the outside of a tackle box or other suitable surface. It includes a mounting bracket and a substantially L-shaped respooling arm pivotally attached to the mounting bracket. The pivoting action allows the respooling arm to be placed in a retracted position flush with the surface to which it is mounted when not in use. A frictionally engaging notch mechanism locks the arm into respooling position prior to use. The device further includes at least one tension-cap to prevent uncontrolled rotation and unfurling of the supply spool fishing line during respooling, and at least one ball-bearing washer to assure that the mounting plate apparatus does not interfere with the respooling operation.