The automobile industry has a history of more than 100 years in foreign countries, so it is the continuous progress of professional automobile enterprises that has promoted the continuous development of the automobile industry. Financial management and database system provide many automobile companies with the best financial management solutions in the industry. As the core of financial management, it is highly integrated with the fixed assets module, which makes the financial management in the information management system of automobile enterprises closely connected with the daily management of automobile enterprises. At present, the original data management of each unit in the financial management system of automobile enterprises is still not subject to regulatory control, and the financial responsibility and financial data are often inaccurate. The current financial system is not scientific in product pricing, and it is difficult to provide detailed and accurate cost analysis and difference analysis results. Finally, for automobile enterprises, a unified and integrated financial management database system should be used to better manage the financial and operating conditions of automobile companies. After outlining the general procedures of the encryption algorithm, this document introduces the security characteristics and sensitivity analysis of the image encryption algorithm key. The security of the image encryption algorithm is strengthened, and the encrypted image is checked separately. Based on this content, this paper analyzes the financial management system of automobile enterprises in general, and explains the process of fixed assets storage and special storage in the software. Then, by optimizing the overall structure design of financial management, the system design of financial management database is proposed. After understanding the shortcomings of current financial software in meeting user needs, the design objectives and tasks of financial management database are provided, and the system design of automobile financial management database is summarized, and the outlook after the system design is put forward.