Abstract: As a critical sealing component in aero-engines, the labyrinth ring made of high-temperature alloy and featuring a hidden-cavity structure presents common challenges in CNC machining, such as difficult chip evacuation and tool chipping. Existing research focuses mainly on conventional configurations, leaving machining strategies for deep-cavity, low-inclination-angle features insufficiently developed. In this study, a high-quality machining solution for such structures was established through systematic parameter optimization. Orthogonal experiments were conducted to analyze the coupled effects of feed rate f, cutting speed v_c, and cutting depth a_m. Results demonstrate that cutting depth exerts a decisive influence on roughing efficiency and deformation control, with ranges of 20.0 and 0.39, respectively, whereas feed rate dominates the surface roughness in finishing, with a range of 0.48. By innovatively implementing a "cutting from both tooth sides toward the center" strategy, issues related to chip accumulation and tool jamming were effectively mitigated. The optimized process improves roughing efficiency by 26.7% and reduces finishing surface roughness by 37.1%. This study provides a reliable machining solution for hidden-cavity complex components and demonstrates significant engineering applicability in aerospace precision manufacturing.