The invention relates to an electric power customer credit comprehensive evaluation method based on the grey relational degree, and belongs to the field of electric power analysis. The new electric power customer credit evaluation indexes including big customer direct-purchase electricity contract breach electric quantity ratio and the new energy power generation grid connection quantity are taken into consideration, and an electric power customer credit rating evaluation index system is established in the seven aspects of electricity utilization payment credit, the electric power law and regulation credit, the electric power cooperation credit, the operation capacity credit, the social communication credit, the mortgage credit guarantee and development prospect credit of the electric power customers. Three evaluation methods with different attributes including a layer analysis method, an entropy weight method and a neural network method are integrated, combined weight is adopted, linear combination coefficients are determined by minimizing the deviation between single evaluation weights and combination weights, the potential information of an evaluated object is fully extracted, and the one-sidedness of a single evaluation method is avoided. Compared with the prior art, the electric power customer credit comprehensive evaluation method based on the grey relational degree has the advantages that a grey relational degree analysis method is adopted, operation is easy, efficiency is high, and the quantity of needed data is small.