In recent years, with the rapid development of semiconductor technology and distributed energy generation, DC power supply gradually shows the advantages of technology, economy and environmental protection, and DC power distribution technology has attracted wide attention at home and abroad. DC power quality is one of the key issues in the planning, design and operation control of DC distribution network, which directly affects the application and development of DC distribution technology. The research on classification algorithm of DC power quality disturbance waveform is of great significance to the practical engineering application of DC distribution network. In this paper, the AC/DC simulation system is built to simulate various DC power quality problems and monitor abnormal waveforms. The characteristics of the waveforms of power quality disturbance caused by different disturbance sources are analyzed. The type of disturbance waveform is identified by training the support vector machine of binary tree structure. The simulation example verifies the feasibility and high accuracy of the method.