The article, based on a comprehensive systematic analysis of national legislation in the field of financial security, considers the problems of building a system of legal acts, which are closely related to many topical issues of jurisprudence, first of all, to the creation of a unified legal space of Ukraine and the problem of the effectiveness of legal regulation. A legal act is considered as one that expresses the will of the subject of law and a decision drawn up in the established order, designed to achieve socially positive goals (regulate social relations) and carries certain legal consequences.
 All these questions need scientific understanding. The goal is to solve the scientific task of developing a complex of theoretical provisions and practical recommendations regarding the formation of a mechanism for ensuring the financial security of Ukraine.
 The article uses methods of analysis and synthesis, formal-logical, financial-economic, comparative-legal, historical, systemic, analytical, statistical. It was determined that financial security was studied as a dynamic phenomenon, that in a practical sense, security should be understood as a property (state) of finances in which the probability of undesirable changes in some of their qualities is not higher, but not lower than certain limits.
 The correlation between various legislative acts is carried out. It was investigated that financial security does not exist for the sake of security as such, but is aimed at ensuring expanded reproduction, achieving economic growth and increasing the welfare of the people, which was reflected in the interpretation of the concept of financial security. The interpretation of the concept of "ensuring financial security” has been clarified, which is proposed to be considered as an activity of the state and society, aimed at the implementation of a national idea, at the protection of national values and interests in the financial sphere, which is implemented through the support of financial stability, which is expressed in the form of a balance of independent links and elements financial system of the state.