The construction of electric vehicle charging equipment is an important foundation for building green travel, but high-power charging equipment also has a certain impact on the surrounding electromagnetic environment. This article takes high-power DC charging piles as an example. Firstly, based on the principle of charging pile operation, the reasons for electromagnetic interference generated by charging piles are analyzed in depth; Then, using finite element simulation software, the influence of heat dissipation holes on the electromagnetic shielding performance of charging piles was analyzed; The research results indicate that, under a certain area, the more holes there are, the better the shielding effect; And in a certain number of cases, circular holes have better shielding effects than rectangular holes, and the larger the spacing between heat dissipation holes, the better the shielding effect.