China is the advocator and builder of the thought of a community with a shared future for mankind. The international dissemination of its discourse requires more solid theoretical supporting research. Hence, the thought of a community with a shared future for mankind is China's intelligent contribution to the world and has been instrumental in solving major regional and global problems. Consequently, the Chinese academic community has the responsibility and obligation to convey the thought of a community with a shared future for mankind to the world in an understandable, objective, and authentic discourse. Further, it is responsible for continuously enhancing the scientific aspect and feasibility of the thought through academic achievements and excellence, thus establishing a leading research system. Currently, COVID-19 jeopardizes global public health security, including in political, economic, and social arenas. However, countries across the world are already in a state of close ties and destiny. Amid global public security incidents, the thought of a community with a shared future for mankind is connected by common interests, values, and responsibilities. Through the value resonance of its theoretical connotation, contacts and cooperation between countries are promptly promoted to form a close community of interests, health, destiny, and responsibilities to jointly respond to global crises and disasters. Therefore, amid the critical global fight against COVID-19, society urgently needs to forge an international consensus for fighting against this virus and maintaining global public health and safety with the thought of a community of a shared future for mankind. Accordingly, based on the perspectives of geopolitics and community, this paper first attempts to explore a theoretical analysis of the thought of a community with a shared future for mankind regarding scientific connotation, historical evolution, and contemporary values. Then, we examine specific cases to explain the practical applications of the thought of a community with a shared future for mankind in the fight against COVID-19 from the perspective of domestic practice, the Chinese program, and Western practice. Further, in doing so, we aim to demonstrate its dual value in spread and practice as well as its plight. Finally, we propose that governance and responsibility in the post-COVID-19 era, based on the thought of a community with a shared future for mankind, should be implemented by countries globally. Doing so involves playing a significant role in promoting global cooperation, maintaining world public health security, preventing a global recession, eliminating secondary disasters arising from COVID-19, transforming global governance, and reshaping international geopolitical relations. Therefore, this article may contribute to human society in fully and objectively understanding the thought of a community with a shared future for mankind, thus leading it to play a greater role in solving major global issues such as public health emergencies.