Abstract: Tie-rod cantilever steel scaffolds are widely used in construction engineering, but their structural weaknesses remain unclear, particularly regarding the stress conditions of the double ear ring pull bolts connecting the diagonal braces. This study employs a combined approach of experimental testing and finite element simulation. In the experimental phase, three groups of cable-supported cantilevered steel scaffolds with different brace lengths were selected. Under progressively increasing loads, the load-deformation curves of the I-beams and the strain of the double ear ring pull bolts connecting the diagonal braces were measured. Concurrently, finite element simulations were conducted to validate and supplement the experimental results, enabling a more comprehensive understanding of stress distribution across components. The findings reveal that during loading, the load-displacement patterns of different-length cable-supported cantilevered I-beams remain consistent throughout various sections. Except for significant plastic deformation observed in the double ear ring pull bolts connecting the diagonal braces, no apparent plastic deformation was detected in other components. Further analysis identifies these double ear ring pull bolts as the structural weak point. A calculation method for determining the stress on these anchor bolts was derived based on the maximum tensile stress theory, providing a simplified yet reliable analytical approach for practical engineering applications of cable-supported cantilevered I-beams. This methodology effectively ensures the safety of cable-supported cantilevered steel scaffolds during operation, offering significant technical support for engineering practices.