Objective To investigate the method and effect of Stryker single-arm upper limb external fixator fixation in the treatment of pediatric proximal humerus fractures. Methods Twenty-five cases of proximal humerus fractures in children were treated with closed reduction Stryker single-arm upper limb external fixator, and the external fixator was removed after fracture healing. The children were aged from 6 to 14 years old, with an average of 9.2 years old; all 25 cases were followed up for 6 to 15 months, with an average of 10.3 months, and the clinical healing time of the fracture was 6 to 12 weeks. The fracture healed in all cases, and the external fixator was removed at a mean of 52 d (40 ~ 89 d) postoperatively. consant-Murley score: excellent: 23 cases; good: 2 cases; poor: 0 cases. Conclusion Closed reduction Stryker single-arm upper limb external fixator fixation for pediatric proximal humerus fracture is simple, minimally invasive, easy to reset the fracture, satisfactory fixation, easy care, can avoid epiphyseal injury and fracture re-displacement, facilitate early postoperative functional rehabilitation exercise, and is a better method for treating pediatric proximal humerus fracture, which is worth promoting.