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In modern production, the precision and the importance of rotating machinery is higher and higher, in the direction of large-scale, high speed and automation development, so that the traditional fault diagnosis methods are insufficient to deal with massive, multi-source and high-dimensional data, cannot meet the requirements of security and reliability; Therefore, several typical deep learning models are briefly introduced at first, and the application of deep learning in fault diagnosis of rotor system, gear box and rolling bearing in recent years is studied and analyzed based on its strong feature extraction ability and advantages of clustering analysis. Finally, the advantages and disadvantages of deep learning model are summarized, and the fault diagnosis methods of rotating machinery are summarized and prospected based on engineering practice.