Fatigue damage of bridge cables is one of the main reasons for safety accidents of bridges in use. The cable fatigue test can obtain the fatigue life parameters of the finished cable, which is of great significance to estimate the service life of the bridge and improve the design scheme of the finished cable. The fatigue test cycle is long, the information obtained by manual inspection test process is limited, and the number of load cycles during fatigue failure cannot be determined. The sound pressure signal in the test is recorded with a recording pen, and the kurtosis analysis method is introduced into the sound feature extraction of fatigue failure to accurately determine the time of fatigue failure, which enriches the significance of cable fatigue test. The practical application shows that the proposed method is effective.