Through the application of partial discharge detection technology, weak partial discharge signals can be detected to ensure the normal stability of the insulation structure of distribution transformers. In this paper, the detection methods of partial discharge such as pulse current method, ultrasonic detection method, UHF detection method, dissolved gas analysis method, and transient-to-ground voltage detection method are technically sorted out and summarized. And put forward the views on the future development trend of partial discharge detection technology, and the specific ideas of follow-up research.