The invention discloses a string winder of an electric guitar, which comprises a handle (2), a string winder bracket (5), a string spindle (7), a worm (10), a worm wheel (12) and a fastening bolt (9), wherein the worm (10) is a driving gear, the worm wheel (12) is a driven gear, and one end of the worm wheel (12) cooperates with the worm (10); the fastening bolt (9) penetrates through the string spindle and is fixed to the string winder bracket; one end of the string spindle (7) is wound with the string, and the other end of the string spindle (7) is driven by the worm wheel (12) to rotate; one end of the worm (10) cooperates with the worm wheel, and the other end of the worm (10) is connected with the handle (2); the end of the string spindle is installed on one end of the string winder bracket (5) through an external thread, and the inner hole of the string winder bracket (5) and the string spindle (7) are in sliding fit; and a string spindle gasket (6) with favorable sliding performance is arranged between the string spindle (7) and the string winder bracket (5), thereby providing convenience for locking the string spindle.