At the beginning of 2020，Britain withdrawl from the European formally. It is mean the Britain will no longer enjoyed the dividend from European Union’s digital market，and digital economy will face unprecedented challenges. This article combs the historical evolution of the British digital economy strategy since 2009. From the changes in strategy and policy，we can see the supporting role of the digital economy in the development of the British economy. Then，from the perspectives of people，finances and things，it analyzed the current situation and existing shortcomings of the British digital economy，and finally summarized the development trend of the British digital economy.