The role of marketing strategy in the industrial structure adjustment and development of financial institutions in the era of the digital economy has changed marketing strategy and made the industrial structure adjustment of financial institutions in the era of the digital economy a hot spot. However, in the process of changing the marketing strategy of financial institutions, there are problems such as poor marketing concepts, weak online sales capabilities, network data analysis, and small mining volume. The main reason is that the traditional marketing model does not use information management technology to restrict the development of financial institutions. Therefore, this paper proposes a marketing method based on information management technology to plan the marketing strategies of financial institutions with different networks. First, phyton software is used to collect financial institutions' marketing data from the Guoan Tai database in 2018~2022, and according to the collected data of 33 financial institutions for analysis. Then, the judgment of marketing strategy is based on information management technology to improve the accuracy of financial institutions' selection of marketing strategy. The adjustment results show that under the background of the digital economy, information technology can improve the marketing strategy selection of financial institutions, promote the optimization of marketing strategies of financial institutions, and respond to the requirements of the financial market. Information technology can improve the accuracy and effect of marketing strategy selection of financial institutions, making its accuracy greater than 90%, which is significantly better than 80% of the manual identification method. At the same time, information technology can improve the recognition rate of marketing strategy, which is more than 80%, and provide support for the formulation of marketing strategy. Therefore, under the condition of a digital economy, industrial structure has a significant impact on the marketing strategy of financial institutions, while information technology methods can identify strategic indicators, improve the effect and accuracy of strategy formulation, and promote the development of financial institutions.