The large-scale integration of electric vehicles will have an impact on the reliability of distribution networks. Based on the traditional assessment methods of the operational health status of charging piles, a health assessment method for charging piles considering comprehensive factors such as performance, stability, lifespan, and environment is proposed. Firstly, the characteristics and working principles of charging piles and the influencing factors of safety are analyzed. Secondly, a scientific weight distribution system combining subjective and objective factors based on the Analytic Hierarchy Process (AHP), Entropy Weight Method, and improved fuzzy evaluation is established, and a vehicle-grid interaction evaluation model is proposed. Then, the health evaluation process is presented. Finally, the reliability and practicality of this method are verified through experiments, and the influence of first-level and second-level health indicators on the multi-dimensional health assessment of charging piles is studied respectively. The key issues of the integration and interaction between new energy electric vehicles and the power grid are addressed. The results of the case study show that the method proposed in this paper has good iterative and extensibility, providing a flexible, evolvable, and easily adaptable implementation strategy and methodology for the future large-scale integration and interaction of “people-vehicles-piles-stations-networks”.