The concept of energy 4.0， which adapts to industry 4.0 is proposed in this work. Its main feature is that it combines the wind energy， solar energy， nuclear energy and other fossil energies which are energy providers with the high-energy-consuming industries such as electrolytic aluminum， chlorine alkali， large-scale desalination of sea water， hydrogen， clean coal， coal chemical and metallurgy industries by the internet of things. This energy & industry internet is a high efficiency， low cost， sustainable， and regulatory network. energy 4.0 will play an important role in industry upgrading and economic restructuring.