Two-dimensional (2D) ferromagnetic topological materials (FMTMs), capable of integrating spin-polarized conduction and nontrivial quantum states, are pivotal for advancing spintronic and topological microelectronics. However, existing 2D FMTMs face a critical trade-off between robust quantum phenomena (e.g., quantum anomalous Hall effect, QAHE) and optical transparency. Here, we demonstrate through first-principles calculations that a Mo-doped LiMgAs monolayer $\left({\mathrm{Li}}_{12}{\mathrm{Mg}}_{10}{\mathrm{Mo}}_2{\mathrm{As}}_{12}\right)$ breaks this limitation by synergizing the groundbreaking features: (1) strain-robust Weyl half-semimetallicity with fully spin-polarized Weyl points near the Fermi level, stable under −5%–5% biaxial strain; (2) topological phase transition to QAHE via spin-orbit coupling (SOC), yielding a Chern number C = +1 and quantum anomalous Hall effect; and (3) unprecedented optical transparency (without SOC) exceeding 90% in the visible spectrum, outperforming conventional 2D magnetic systems. Remarkably, the ${\mathrm{Li}}_{12}{\mathrm{Mg}}_{10}{\mathrm{Mo}}_2{\mathrm{As}}_{12}$ monolayer maintains room-temperature-compatible thermal stability (300 K ab initio molecular dynamics simulations) and a much higher Curie temperature $(T_{\mathrm{C}}=178 \mathrm{K})$. This multifunctional integration of half-metallic ferromagnetism, topology-switching capability, and ultrahigh transparency positions ${\mathrm{Li}}_{12}{\mathrm{Mg}}_{10}{\mathrm{Mo}}_2{\mathrm{As}}_{12}$ as a promising material for designing transparent quantum Hall sensors, low-power spin filters, and wearable optoelectronic devices, thereby bridging quantum topology with photonic technology.

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• Quantum anomalous Hall effect
• Topological materials
• Weyl semimetal
• Ab initio molecular dynamics
• First-principles calculations