The agro-industrial complex, producing products vital for society, is one of the most important components of the economy of the Russian Federation. The study was conducted to assess the development of the agro-industrial complex and measures to stimulate its investment activity. The largest area of the agro-industrial complex is agriculture, the sustainable development of which is a priority for the state to ensure the country’s food security. Thanks to state support, the agro-industrial complex is demonstrating steady growth. However, problems remain in the industry, the solution of which will strengthen the role and quality of the main directions of the state agrarian policy of the country. Creating a favorable investment climate in the agro-industrial complex is an effective way to develop the industries included in its structure. Measures to stimulate investment activity include: modernization and replacement of production facilities; provision of preferential terms for lending and leasing for participants in the agro-industrial complex; tax incentives; grant support for agricultural producers, agricultural consumer cooperatives, peasants, farms, individual entrepreneurs producing agricultural products; creation of agro-industrial parks. The practice of applying the unified agricultural tax for 2011-2021 in Russia, including in the context of federal districts, showed that, despite the reduction in the number of those applying this taxation regime, there is an increase in the amount of tax calculated. For the development of the agro-industrial complex, it is necessary to introduce non-financial instruments of state support.