Large-span cable–truss spatial structures are characterized by long spans, complex configurations, and significant nonlinear mechanical behavior, which lead to key technical challenges in form control, prestress tension control, and sensitivity to construction errors during the design and construction stages. Given the impracticality of full-scale testing (e.g., high cost and operational difficulty), this study designed and implemented a 1/20 scaled cable–truss model test, taking the roof structure of the professional football stadium at Hangzhou Yuhang International Sports Center as the engineering prototype.A hybrid research method combining theoretical analysis and model testing was adopted: first, the scaled model was designed and fabricated; second, the similarity relationships for geometry, load, displacement, and strain were systematically analyzed; and third, the validity of the scaled model was verified via finite element simulation. Test results under construction forming and static loading conditions showed good consistency with theoretical analysis results, with all deviations controlled within a reasonable range.The findings indicate that the scaled model can effectively reflect the mechanical performance of the prototype structure. This study provides a reliable experimental foundation and methodological reference for subsequent research on construction control, prestress deviation evaluation, and progressive collapse resistance of complex spatial structures.