With globalization and comprehensive development in Chinese society, the importance of cross-cultural competence has become evident. Based on the existing literature, this article discusses the correlation between cross-cultural competence and social media among international high school students. The paper analyzes the significance of cross-cultural competence and explores the impact of internet-mediated social media on two international high school students. The study reveals the crucial role of cross-cultural competence in facilitating communication, understanding, and personal growth and development among high school students. Social media offers opportunities for communication with individuals from diverse cultural backgrounds, enhancing awareness of different cultural values, beliefs, and perspectives, and promoting cross-cultural exchange and interaction. Using social media can strengthen cross-cultural communication and understanding. Key aspects to improve in enhancing cross-cultural competence include cross-cultural communication skills, cultural sensitivity, adaptability, respect for others differences, open-mindedness, and learning about different cultural backgrounds.