The article provides in-depth theoretical and methodological fundamentals, methodological approaches and develops practical guidelines how to increase competitive ability of the agricultural sector of the Ukrainian economy. It also provides economic essence of the competitive ability of the agricultural sector, defines methodological approach as to diagnosing a general level of competitive ability of the agricultural sector, aimed at analyzing intersectoral and intrasectoral competitiveness of the economic sector. The article analyzes current state of the competitiveness determinants of the agricultural sector of Ukraine, analyzes its general competitive ability in inter- and intrasectoral dimensions. It provides recommendations as to improving system for the state regulation of developing competitiveness of the agricultural market. Suggested sectoral and structural matrix of the state regulation of developing agricultural sector competitiveness of the domestic economy allows us to segregate priority directions of the state regulation so to contribute to competitiveness increase based on sectoral and segment approaches. The article justifies perspective transformations of organizational and legal forms of management of agrarian products manufacturers, which contribute to establishment of competitive structure of the agricultural sector of the Ukrainian economy and increase of its competitiveness level in general.