The article considers the monetary policy as a special prevailing type of state economic policy in the modern system of economic knowledge based on using a wide range of instruments for regulating the volume of money supply, rate of money circulation and cash flows. According to the main directions of the unified state monetary policy for 2019 and a period of 2020-2021, a consistent monetary policy aimed at maintaining low rates of price growth increases the predictability of economic conditions, allows for more confident production, investment plans and long-term savings. Only if price stability is maintained it is possible to achieve the targets of the main macroeconomic factors of the state. It is inflation that is an essential factor in ensuring macroeconomic and economic stability. The main reasons for inflation are listed: decreasing GDP while maintaining the volume of money in circulation, increased government spending due to emission and excess over income, monopoly in the economy, some political processes, foreign economic sanctions against commercial and state companies, etc. There has been studied the influence of theoretical aspects of inflationary and price security in the context of using modern instruments of the state's monetary policy. The work of both Russian and foreign specialists in the field of economic security of the state has been analyzed, as well as materials from periodicals by leading economists. The main research methods used in writing the work were general scientific methods of induction and deduction, the method of theoretical systems analysis, and the monographic (descriptive) method.