In the globalized world arena, enterprises have to meet higher standard for showcasing their strength, as well as communicating with other enterprises from different cultural background. The business English ability, as one of the means of intercultural business communication, puts forward higher requirements and has become has become one of the important indexes to measure the international competitiveness of enterprises. Therefore, high proficiency in business is needed. We examines the impact of business English proficiency on the competitiveness of small and medium-sized enterprises (SMEs) from the perspective of resource-based theory. By using a quantitative research methodology, we could clearly recognized the impact of business English proficiency on enterprise competitiveness. The results of the study show that business English proficiency is a key resource for SMEs to enhance their market competitiveness, and there is a significant positive correlation with the market orientation, innovation ability and strategic flexibility of enterprises. As an intangible resource, business English proficiency significantly enhances the market performance, financial performance and operational efficiency of enterprises by increasing their market sensitivity, promoting knowledge innovation and enhancing the flexibility of strategic adjustment. In addition, the study finds that the role of business English proficiency varies across industries and sizes of firms, with smaller firms and highly internationalized industries benefiting more significantly. This study provides important theoretical and practical guidance for the development of SMEs in the context of globalization.