Although Britain won the war and gained new colonies from it, the huge expenses of the war prevented Britain from continuing to bear the huge financial expenses needed to maintain an empire. Millions of people died in Britain and countless assets were destroyed. As a result, the debt is high, the capital market is chaotic, and the number of British officials in overseas colonies is scarce. At the same time, the nationalism of both the old and new colonies is on the rise, which is further fueled by the participation of the empire and the strong racial discrimination felt by non-white soldiers in the war. Specifically, the impact mainly includes:

Economically, pre-war creditor countries became debtor countries after the war. After the long-term economic downturn, the international financial center moved from London, England to new york, USA. During World War I, the British merchant fleet suffered huge losses, which made its shipping industry suffer heavy losses and also led to the decline of British trade volume.

Politically, it is mainly reflected in the decline of the British Liberal Party. Before the outbreak of World War I, the British Liberal Party initiated a revival through a series of social reforms and legislation. History has proved that it was under the influence of the First World War that domestic contradictions and political conflicts in Britain intensified, which led to the decline of the British Liberal Party. In this process, World War I showed a powerful catalytic role. 19 18, the liberal party was still able to unite with other political forces to maintain Lloyd George's position as prime minister, but its votes in the general election continued to decline. In the general election of 1923, the Labour Party surpassed the Liberal Party for the first time and became the second largest party in Britain, and the Liberal Party never became the second largest party again.

In terms of international influence, although Britain maintained its position as a leader in international affairs at the Paris Peace Conference after World War I, due to the serious retrogression of its economic and military strength, it is actually impossible for Britain to control the world as it did before World War I, and the world political and military hegemony of "the sun never sets on the empire" has existed in name only. The Washington Naval Conference stipulated that the strength of British and American navies should be consistent, which showed that Britain had no choice but to admit the fact that it was no longer the global hegemon after World War I..

In society, World War I caused a large number of British men to leave their original jobs and join the war. Women, who have always been regarded as the weak, took over the jobs of men and took part in a lot of wartime work. On the one hand, women, as the mainstay of the family, shoulder the heavy responsibility of stabilizing society; On the other hand, women were widely employed and directly participated in wartime economic and social affairs, which made indelible contributions to Britain's final victory in the First World War. This not only greatly improved the social and economic status of women, accelerated the development of feminist movement, but also weakened the traditional prejudice against women in British society. After the impact and influence of World War I, British women finally got the right to vote. Therefore, World War I promoted the development of British women's liberation movement.

In terms of colonization, although the territory increased after the war, its control over the territory was greatly reduced due to the huge casualties and material losses in the war. Since then, many British colonies began to become independent, which had a great influence on all aspects of British society.