The subject of the research is the analysis of the humanitarian aspect of the Great Britain's foreign policy. The aim of the research is to define conceptual grounds, instruments and conctents of the humanitarian activity performed by the United Kingdom outside its borders. The main research methods include logical terminology and systemic-functional analysis. Using the logical terminology analysis method, the author has defined conceptual framework of the humanitarian aspect of the Great Britain's foreign policy. Using the systemic-functional approach, the author has studied different activities of the Foreign office. Response to extreme situations abroad is defined as the core element of British humanitarian activity. At the same time, the author offers a wider interpretation of that activity as the project of 'soft power' of the United Kingdom in the modern world. The author analyzes 'soft power' strategies of Britain which humanitarian orientation is mostly apparent. This is the policy to expand educational opportunities and promote development of civil society in different countries and regions of the world. The author also analyses what Britain political elite thinks of possible employment of military force based for humanitarian purposes and how the concept of 'Responsibility to Protect' is viewed by the Britain political class. The scientific novelty of the research is caused by the fact that the author evaluates the influence of Brexit on the change of humanitarian contents and values in the Great Britain's foreign policy. The main result of the research is the author's conclusion about negative consequences of Brexit. The author predicts the decline of humanitarian responsibility and role of the United Kingdom in the  modern world. The results of the research can be used in the sphere of education. The research is closed up with the conclusion that there is a great number of factors that influence how states define their own 'humanitarian role' on the global stage.