The business environment involves social and economic reforms and opening to the outside world. It is an important manifestation of a country’s soft power and an important aspect of its international competitiveness. The research found in this article：First，the UK’s business environment after Brexit fluctuates significantly in the global ranking；second，although the UK and the EU finally reached a trade agreement to avoid a “hard Brexit”，the economic，social，The market environment and other indicators are facing greater uncertainty，which has a significant negative impact on the British business environment；third，under the impact of the new crown epidemic，various economic indicators in the UK have fallen sharply into economic recession，and the business environment has been directly affected；Fourth，the British immigration policy is no longer affected by the European Union. The new immigration system aims to reduce the number of immigrants，eliminate low-skilled workers，and “grab” elites worldwide，which has a significant positive impact on the business environment.