Abstract: The multilayer riveted structure is the main structure of aircraft fuselage skin and profiles. Due to periodic loading, fatigue cracks are prone to occur in load-bearing parts such as internal profiles, which are highly concealed and difficult to detect using visual and conventional nondestructive testing techniques. The far-field eddy current detection technology can detect defects with a large burial depth, so it was applied to the inner layer crack detection of aircraft multilayer riveted structures. The results indicated that the amplitude of the detection signal impedance had a good linear relationship with the crack depth, and the phase angle of the detection signal impedance had a good linear relationship with the crack burial depth by selecting an appropriate detection frequency. For the determined tested material and detection sensor, the fitting formula obtained can provide a theoretical reference for the localization and quantitative detection of crack damage, thus obtaining accurate information of cracks and achieving accurate localization and quantitative detection of crack damage.