The article defines the sequence of assessing the competitiveness factors of the agricultural sector (economic, international, political and legal, technological, social and natural climatic). The scientific approaches to the formation of the mechanism of the strategy realization of ensuring the competitiveness of the agrarian sector of Ukraine are substantiated. In the internal environment of such a mechanism is an interconnected complex of basic components and subordinate elements that reflect the specifics of modern market concepts in agricultural production aimed at ensuring the effective development of the agricultural sector and ensuring food security of the country. An integrated system for managing the competitiveness of the agricultural sector contributes to economic activities, improving product quality and ensuring food security. The article investigates that the agro sphere needs the state support in the reorganization of industrial and economic ties, in particular in the development of various forms of cooperation (including credit), organization of wholesale agro-food markets and the development of the agricultural market infrastructure. In such circumstances, it is essential to significantly expand the state regulatory functions, especially in terms of price regulation, in particular the support of prices for agricultural products, as well as in the strategic programming of the agricultural sector development.The purpose of the article is to investigate and analyze the complex mechanism of implementation of the strategy of ensuring the competitiveness of the agrarian sector of Ukraine as the main task of state policy.