Due to the uncertainty of Brexit and the drag of the international economic and trade environment，the overall economic growth of the UK is weak this year，which falls behind that of the EU. Specifically，the EU’s high economic growth and the UK’s gradual economy decline are clearly differentiated. Coupled with the continued decline in the attractiveness of international investment，the inhibition of consumption on economic growth，occupation of monetary policy adjustment space by high inflation and high unemployment，the long-term negative effects of the Brexit began to emerge. However，in the face of possible negative spillover effects of Brexit，flexible trade，monetary and fiscal policies may help to release economic vitality after the formal Brexit，leaving still huge space for Britain’s economic policy. The trajectory of Brexit remains uncertain at the moment. As the deadline for Brexit approaches，the game will become increasingly fierce.