Abstract: In the context of the rapid development of big data, power marketing informatization construction faces new opportunities and challenges. In order to cope with the diversity of data sources, the complexity of user demand and the risk of information security, this paper analyzes the existing technical challenges of power marketing informatization and puts forward targeted construction strategies. Starting from improving the data collection and management mechanism, strengthening the information system security measures, and enhancing the user demand response service capability, this paper discusses how to use big data technology to optimize the allocation of electric power resources, improve the quality of user service and enterprise competitiveness, aiming to provide theoretical support and technical path for power marketing informatization, and to promote the intelligent transformation and upgrading of the electric power industry.