Abstract: The ecological concept of "unity of heaven and man, and coexistence of all things" is a spiritual symbol of excellent traditional Chinese ecological culture, involving the thoughts of Confucianism, Buddhism, Taoism and other schools of thought, and has a high degree of value compatibility with Marxist ecological views. General Secretary Xi Jinping, in guiding the practice of building ecological civilization with Chinese characteristics in the new era, combines the basic principles of Marxism with excellent traditional Chinese culture, inherits and innovates the ecological concept of "unity of man and nature, and coexistence of all things", and systematically expounds the theoretical propositions of ecological civilization. Based on the ecological concept of "unity of heaven and man, and coexistence of all things" as the theoretical foundation of the "second combination", General Secretary Xi Jinping attaches great importance to quoting the language essence that embodies the ecological concept of "unity of heaven and man, and coexistence of all things", actively promoting the ecological wisdom of "unity of heaven and man, and coexistence of all things", inheriting and absorbing its people-oriented thinking and ecological holistic view, and discussing the basic principles, core concepts, and purpose requirements of ecological civilization construction from multiple perspectives and all aspects, forming a rich and complete Xi Jinping ecological civilization thought.