Purpose. The aim of the article is scientific substantiation of theoretical and methodological bases of the financial mechanism for ensuring public welfare with application of a dialectical method of scientific knowledge. Methodology of research. The methodological basis of the study is formed by the dialectical method of scientific knowledge, which involves the application of basic laws, principles and categories of dialectics. The following methods are used in the article: analysis and synthesis, generalization – in the study of literature sources on the research topic; abstractions, inductions, deductions, ascent from the abstract to the concrete – in the disclosure of the financial mechanism of ensuring public welfare in terms of the laws of dialectics, the use of dialectical categories, the separation of its functions. Findings. The financial mechanism for ensuring public welfare is characterized on the basis of the new interpretation of the basic laws of dialectics, which eliminates their ambivalence from the following positions: the sequence of causal interaction of its qualitative, quantitative and ordinal parameters; the result of the interaction of the interests of all economic entities involved in the process of forming the parameters of public welfare, which is expressed in the configuration and parameters of the components of the financial mechanism; sequence of transformations of the financial mechanism of ensuring public welfare on the basis of change of a configuration of interaction of its various qualities under the influence of external and internal factors. The application of the basic categories of dialectics made it possible to reveal the financial mechanism of ensuring public welfare in essence, as a phenomenon, in form and content, as well as to distinguish its functions. Originality. The scientific and theoretical foundations of the financial mechanism of social welfare have been developed with the application of a new interpretation of the basic laws of dialectics. The most general, as well as specific properties and characteristics of this financial mechanism are revealed with the help of dialectical categories. Practical value. Deepening the theoretical basis of the financial mechanism of ensuring public welfare will create the preconditions for improving the effectiveness of its elements in financial practice. Key words: financial mechanism of ensuring public welfare, dialectical method, laws of dialectics, dialectical categories, ambivalence.