The non-homogeneous anisotropy of carbon fiber reinforced plastic （CFRP） was prone to causing processing defects and material damage during secondary processing，leading to deviations in material performance and affecting design standards.Currently，the characterization of CFRP processing quality and its influence on material mechanical properties were not fully studied.This paper adopt a multi-scale characterization method，selected burr height Δh，three-dimensional roughness Sa value，and surface porosity P as the evaluation indicators of CFRP milling quality，and explore the influence of milling parameters on the above evaluation indicators.Through the mechanical property tests of V-shaped shear specimens and open-hole tensile specimens，the influence laws of each index on mechanical properties were studied.The results show that the spindle speed and feed rate are the main factors affecting burr height and three-dimensional roughness，while the cutting depth has a significant impact on surface porosity.At the moment，it is found that the open-hole tensile strength is more sensitive to processing quality，with the highest strength degradation of 14.3%；three-dimensional roughness and surface porosity have a significant impact on the degradation of in-plane shear strength，with the highest strength degradation rate of 10.21%.This study can provide a basis for the research on the correlation between the processing quality and mechanical properties of CFRP structural components in aircraft.