Abstract: International discourse power has always been the key point for sovereign states to express their demands and safeguard their own interests. In recent years, China's outstanding performance in the field of ecological civilization development has been promoting the process of global ecological civilization reform, and also strengthening the right of speech in the field of international ecological civilization discourse. With more than 70 years' development of the People's Republic of China, China's international discourse power of ecological civilization has changed greatly from accumulating China's power to spreading China's voice, from telling China's story to expounding China's claims. In order to build the international discourse power of China's ecological civilization, it is necessary for the whole country to work together, official diplomacy and non-governmental diplomacy cooperate with each other, actively organize multinational and multilateral activities, and undertake the major task of world ecological development. Constructing the discourse power of China's ecological civilization is of important theoretical and practical significance for consolidating the achievements of China's ecological civilization development, building a discourse system of ecological civilization with Chinese characteristics, improving China's position in international public opinion, and deeply participating in global environmental governance.