This spring automatic retractor is applied for minimally invasive spinal endoscopic surgery. Equipped with an elastic spring structure, it automatically expands and fixes soft tissues after placement, eliminating continuous manual holding and freeing hands for other instruments. The wide blunt retracting blade steadily pushes aside paravertebral muscles, with smooth rounded edges to prevent damage to nerve roots and dura mater. Fabricated entirely from medical stainless steel, it maintains stable elasticity without fatigue deformation, resists corrosion, and supports repeated autoclave sterilization for cyclic clinical use.