The invention provides a method and a system for generating and managing a portrait of an electric power customer. The method mainly comprises the following steps: obtaining a refined feature mark through a big data processing technology and a machine learning algorithm, and establishing a dynamic label model; calling the dynamic label model to generate a dynamic label and starting the whole lifecycle management of the label; automatically adding new labels to existing labels, and recalculating and displaying the coverage condition of all the labels and visually displaying the distribution ofall the labels among the total customers; in combination with the existing labels, designing the customer clustering rules under the new business scenario, and carrying out multi-dimensional analysis; in combination with business experiences and the original relevant strategies, developing a differentiated service strategy; connecting the business system to the outside world, pushing the formulated differentiated information push strategies for different channels. The invention constructs a panoramic portrait of a customer in the form of a label, and realizes fine depiction of the characteristics of the electric power customer, and based on this, the customer clustering rules are designed to develop the corresponding differentiated marketing management strategy.