In view of global environmental issues and the "dual carbon" goals, the Hengyang Hel; expansion and intelligent manufacturing southern base project is used as an example to discuss the application of green construction technology in large industrial plants. The project adopts Yonglin combination technology to reduce material wastage, fan-enhanced auger long auger construction technology to reduce energy consumption and pollution, large-area macadam flooring without reinforcement technology to reduce carbon emissions, and assembled equipment base and modular pump house technology to enhance efficiency and reduce construction waste. Meanwhile, clean energy comprehensive utilisation technologies such as photovoltaic power generation and solar street lights optimise the energy structure and significantly reduce carbon emissions. It realises the objectives of resource conservation, environmental protection and sustainable development, and provides a demonstration model for the construction of similar industrial plants, which has an important promotion value.