Capital structure is an important indicator to measure the source, composition, and proportion of a company’s equity and debit capital. It is not only related to the internal operating environment of listed companies but also related to the rights and obligations of shareholders and is closely related to the company’s future development direction, decision-making bodies, and changes in governance structure. This study aims to study the impact of corporate capital structure on financial performance based on convolutional neural network. Based on the relevant theories of capital structure, by constructing a convolutional neural network model, taking a listed company as the research object, this study analyzes the company’s capital structure, liabilities, and other financial conditions. Finally, it is concluded that short-term liabilities can meet the company’s sustainable development and enhance the competitiveness of the industry, thereby increasing the company’s operating income. However, a poor capital structure can negatively impact a company’s finances. By improving the corporate governance structure of listed companies, strengthening the adjustment of the financing structure of listed companies, and strengthening the management of listed company’s operating risks, the company’s capital structure can be improved so that the company’s financial situation can be sustainable and healthy.