<p>To investigate the seismic performance of cold-formed thin-walled steel-composite shear walls with double-layer inclined slots and stiffeners (CFSCWs), low-cycle reciprocal loading tests were performed. The study included analyzing the hysteresis curve, energy dissipation capacity, and stiffness degradation, leading to the identification of three force stages based on the test results. Numerical simulations using ABAQUS software were conducted to evaluate the effects of slotting arrangement, steel strip width, slotting width, height-to-thickness ratio, and span-to-height ratio on the shear bearing capacity of the CFSCWs. A formula for calculating the shear capacity of the wall was proposed based on the observed test phenomena and underlying force mechanisms. The study found that concrete can limit the buckling of steel strips, ensuring that they function effectively under both tension and compression. Strip width, slotting width, height-to-thickness ratio, and span-to-height ratio are critical factors, influencing the shear capacity by up to 33% to 45.6%. The proposed formula accurately predicts the bearing capacity of the CFSCWs, with an error margin of less than 5%. The emergence of cracks in the concrete was identified as a key indicator of CFSCWs transitioning into the yielding stage. The strength of the side columns governs the overall strength of the wall. Therefore, to ensure the optimal tensile performance of the steel strips, strategies such as strengthening side columns and strategically reducing wall stiffness should be considered in engineering design.</p>