<p>Soft soils stabilized with cement, lime, and other curing agents are commonly used as road materials in transportation engineering. While inorganic stabilized soils exhibit high compressive strength, they often suffer from poor tensile strength, as well as susceptibility to drying shrinkage and temperature-induced cracking. High-molecular polymers, produced through emulsion polymerization or copolymerization, offer a promising solution to enhance the ductility of these materials and mitigate their shortcomings. In this study, styrene–acrylic emulsion (SAE) is incorporated into cement to stabilize soft soils for use as road materials. The influence of SAE content on the mechanical performance of SAE-cement-stabilized soils is assessed through various tests, including unconfined compressive strength, indirect tensile strength, dry shrinkage, and temperature shrinkage. Additionally, low-field nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analyses are performed to investigate the mineral composition, pore structure, and morphology of the SAE-cement-stabilized soils, providing insights into the underlying microscopic mechanisms. The results indicate that the inclusion of SAE significantly enhances the crack resistance and tensile properties of the stabilized soil, highlighting its potential as a viable construction material for transportation applications.</p>