The invention discloses a safety belt retractor spindle assembly structure. The safety belt retractor spindle assembly structure comprises a spindle main body and a torsion bar, wherein the torsion bar penetrates through the spindle main body; one end of the torsion bar is connected with the spindle main body, and the other end of the torsion bar extends to the outer side of the spindle main bodyto be connected with a turbine; a secondary force limiting steel wire ring is mounted on the side end face of the spindle main body, and the secondary force limiting steel wire ring penetrates throughthe torsion rod and can deform to rub with the side end face of the spindle main body to generate resistance, and thus secondary limited force to the torsion rod is formed. The safety belt retractorspindle assembly structure has the beneficial effects that the secondary limited force can be formed by adopting a structure that the torsion rod and the secondary force limiting steel wire ring are matched with the spindle main body, it is effectively ensured that a spindle assembly can operate stably in the locking process, the secondary force limiting steel wire ring can reduce the torsional force borne by the torsion rod, the using performance is improved, the structure is simple and compact and the safety belt retractor spindle assembly structure is convenient to produce and machine.