In the context of the current rapid economic development, the process of accelerating digitization has become an urgent problem to be solved, and digital currency has therefore emerged. As a new type of currency, digital currency has unique advantages and unique characteristics. This article focuses on digital currency and studies the impact of the emergence of digital currency on various existing economic policies, including monetary policy, financial regulatory policy (including tax policy) and international trade policy. The article analyzes the impact of digital currency on various economic policies and clarifies the pros and cons of each aspect. It also describes the further impact of emerging digital currency types on economic policy and draws the conclusion that the impact of digital currency on the economy is two-sided. At the end of this paper, the author also puts forward opinions on the future development trend of digital currency. The government should look at the influence of digital currency comprehensively and objectively, remove the dross and select the essence, and make the right choice to promote economic development.