Abstract: Under the background of the national promotion of digital transformation to promote the high-quality development of new electricity system, this paper studies the digital twin technology investment strategy of new electricity system, in order to identify the best investment strategy of upstream and downstream enterprises in the electricity supply chain. A secondary electricity supply chain consisting of generators and sellers is constructed, solved by backward induction, and the equilibrium solutions are analyzed by comparision. Investment in digital twin technology by generator is always better than electricity seller. As the cost of investing in digital twin technology increases, the demand for electricity, the amount of digital twin technology investment, the retail price of electricity, and the profits of generator will all decline. As the digital twin technology reduces the production cost of generator by an increasing proportion, under both models, the electricity demand, the amount of digital twin technology investment, and the profits of generator and electricity seller will also increase.