The scientific article is devoted to the study of the purpose of the monetary policy of the central banks of the EU member states and Great Britain, its instruments and legal acts, in which they are fixed. The legislation of the member countries of the European Union (Germany, France, Spain, Poland, the Czech Republic, Hungary) and Great Britain, modern approaches in the science of constitutional and administrative law regarding the definition of the goal of the monetary policy of the central banks of the member countries of the EU, and the range of its instruments are analyzed. Emphasis is placed on the fact that the purpose and functions of national banks are interrelated, but not identical. The concept of the goal of the monetary policy of the Central Banks of the EU member states, the activities and instruments of the monetary policy, the functions of the central bank of the EU member states are delineated. It is argued that reducing the purpose of the activities of the central banks of EU member states and Great Britain exclusively to the implementation of legal regulation of currency circulation in the state and that the main purpose of the central banks of such EU member states as the Czech Republic, Poland, and Hungary is purely to ensure the stability of the currency - is not justified. It is argued that the main joint functions of the central banks of Germany, France, Spain, Poland, the Czech Republic, Hungary and Great Britain are to ensure the stability of the monetary unit, to promote the maintenance of sustainable rates of economic growth, to achieve and maintain price stability in the state, and to support economic policy. It is established that the goal of the monetary policy of the central banks of the EU member states is to ensure price stability, and it is additionally substantiated that the inflationary inclination of the financial policy is the most effective. It was established that the accounting policy, the interest rate policy, and the regulation of mandatory reserve norms, the volume of the money supply, operations on the open market and operations with credit resources, the amount of interest rates, interest rates of the mandatory reserve of banks are not the purpose of monetary and credit policies, instruments of monetary policy of the central banks of EU member states and Great Britain. [ABSTRACT FROM AUTHOR]