The advantage of Britain's exit from the EU is that 90% of the British economy has nothing to do with EU trade. Leaving the EU will leave many small and medium-sized enterprises in Britain outside the EU rules and regulations. The disadvantage is that the loss of EU membership makes it difficult for Britain to rely on the EU to play an important role in European and world affairs, and its international status and influence will be greatly reduced.

In terms of trade, Britain and Europe have always been as close as lips and teeth, and half of the trade volume comes from other European countries. If we leave the EU, the trade relationship between Britain and Europe will be affected, and London's position as an international financial center and a safe haven for funds will also be affected. If a large amount of investment is withdrawn from Britain, the economic outlook may deteriorate further.

British domestic business leaders, including Richard Branson, chairman of Virgin Group, the richest man in the UK, have warned that Britain's attempt to renegotiate its relationship with the EU may pose an uncertain future and harm business interests.

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Due to historical and geographical reasons, since the late19th century, Britain has been pursuing a policy of non-interference in continental European affairs, which is called "glorious isolation". The historical tradition of "Euroscepticism" and the economic development model different from the European continent keep Britain at a certain distance from the European continent.

In the view of "Eurosceptics", some future EU policy trends may harm Britain's interests. The spread of the European debt crisis not only fermented Britain's doubts about Europe, but also accelerated the pace of Britain's withdrawal from the European Union.

At the same time, people in other EU countries are increasingly dissatisfied with Britain. They believe that Britain not only vetoes the euro and does not participate in the EU's crisis rescue plan, but also opposes all financial supervision policies. Therefore, Britain's withdrawal from the EU is a good thing for the development of the EU. Mutual trust between the two sides fell to an all-time low.