Abstract: With the continuous advancement of science and technology, the complexity and technical content of the urban transportation power system continue to increase, making the probability of failures continue to rise, which to a large extent affects the operation of urban rail transit vehicles and the safety of passengers . Based on this, this article discusses in detail the failure analysis and countermeasures of the urban rail transit power system, aiming to provide valuable references and references for relevant professionals, and then better contribute to the healthy and sustainable development of the industry.