In order to comply with the call of the scientific development concept and actively implement the coordinated development of ecological economy, China vigorously promotes the development of new energy industries. As one of the main mobility tools for modern people, cars have greatly improved people’s travel efficiency. Under the general environment, fuel vehicles have gradually moved closer to new energy vehicles. I hope that this will help to reduce urban pollution, environmental pollution and energy consumption. With the support of national policies, the scale of China’s new energy vehicles is getting larger and larger. As of the end of 2019, the number of domestic new energy vehicles had exceeded two million. However, after all, new energy vehicles are an emerging industry, and there are still immature areas in technology. Therefore, it is not difficult to avoid some electrical equipment or line failures during use. Once such situations are found, it will not only affect people’s driving. Experience, there may also be life threatening. For this reason, it is necessary to strengthen the maintenance and protection of the electrical equipment or lines of new energy vehicles on a regular basis. Therefore, this article focuses on the maintenance of new energy vehicle equipment lines to provide technical guidance and reference for the sustainable development of the industry.