[Purposes] This paper aims to enhance the ion exchange depth and mechanical properties of the cover glass by selecting KNO₃/NaNO₃ as molten salt. [Methods] Aluminum-silicon cover glass was chemically strengthened by a low-temperature ion exchange method. Li₂O was added to the glass formula for secondary strengthening of the glass. [Findings] The ion exchange depth of the glass can be significantly improved by adding Li2O to the glass formula while maintaining its excellent mechanical properties. Compared with the traditional low-temperature ion exchange method, secondary strengthening method not only improves glass performance but also avoids the high-temperature processes that may cause glass deformation and surface defects. [Conclusions] The lithium-aluminum-silicon cover glass prepared by adding Li₂O for secondary strengthening demonstrates high impact resistance and other mechanical properties, showing a wide range of application prospects in the fields of aerospace, transportation, electronic products, and clean energy.