The article is devoted to the study of financial depth, peculiarities of the manifestation of its increase in Russia and its connection with the investment activity stimulation. Increasing financial depth is viewed as a process of domination of financial capital over real sector capital and at the same time as a process of increasing power of financial capital representatives who dictate rules both for business and for the entire social economy. The objective of this study was to identify the characteristics of the financialization of the Russian economy with an emphasis on the problem of investment promotion. It was concluded that the policy of the Bank of Russia and the Ministry of Finance of the Russian Federation, which regulate the dynamics of financial depth in Russia, is very contradictory, does not meet the leading international practice and does not help stimulate the investment activity.