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Aiming at the difficulty of detecting the carbon brush structure fault in the generator excitation system and the inaccurate fault location, this paper establishes a carbon brush structure detection system based on the actual carbon brush operation process. By establishing a Component Object Model COM (Component Object Model COM) dynamic detection program to model the carbon brush structure, the system can detect the cause of the failure more accurately. Design a digital optical fiber sensor (BF5R) detection circuit to visualize the carbon brush failure process and shorten the system detection time. By improving the Wigner Ville distribution WVD (Wigner Ville distribution WVD) fault location algorithm to accurately locate the carbon brush fault location, and use reasonable methods for maintenance. Through the Proteus software to simulate the operation process of the detection system, the experiment shows that this design has obvious effects on carbon brush fault detection. In a 15KW generator environment, the carbon brush fault location time is 3.5min, the signal amplitude is 13V, and the result accuracy is 96.4% , Confirmed the feasibility of the design; through simulation and comparison of three different system signal detection amplitude voltage and detection accuracy curve, thus verifying the superiority of this research.