The Chinese opera is a local art in China and an important carrier of Chinese culture. It embodies the spirit of Chinese aesthetics, and is generally recognized as a recognizable representative of Chinese culture and art. In the omnimedia era, the omnimedia platforms enable Chinese opera to appear frequently on the international stage. Meanwhile, the digital technology plays an important role in promoting the cross-cultural communication of opera culture, which make global audiences can enjoy Chinese opera culture through omnimedia channels and gradually increase their acceptance of it. Therefore, the effect and influence of Chinese opera culture in international communication is significantly improved. However, it should be noted that cultural differences are the main obstacles to the intercultural communication of Chinese opera in the omnimedia environment. The copyright and intellectual property right in the omnimedia environment limit the international communication of Chinese opera culture, and there are contradictions between the localization and the globalization needs of opera culture in the omnimedia promotion. To this end, it is necessary to present in-depth cultural interpretation and exchange on the all-media platform to bridge the cultural differences between China and foreign countries, establish corresponding international cooperations and legal protection mechanisms to deal with copyright and intellectual property issues, and use omnimedia to innovate the promotion of opera culture to achieve a balance between localization and globalization. These methods can enhance the cross-cultural output of Chinese opera culture and the international communication intensity and effectiveness of it, so as to enhance the cultural soft power construction and the international influence of China.