The digital currency, which was first produced by blockchain technology, has had a great impact on the financial field. The research and application of blockchain technology has become an important task in the financial field today. In essence, blockchain technology still belongs to a technical means and tool. Its application in the financial field and in the real economy are parallel, with their respective relative independence, but there is a certain overlap, that is to say, the promotion of the real economy is indirect. 1. Trust is one of the foundations of the transaction between supply and demand, whether in finance or entity. At present, banks to enterprises, enterprises to enterprises, enterprises to people, etc. are all linked by money. The right to issue money belongs to the state and the right to operate it belongs to the bank. With the further popularization and wide application of blockchain technology, enterprises and enterprises, or individuals and individuals can issue digital currency (digital credit) by themselves in the future, and the status of banks will change from the current monopoly operation to the equal competition operation in the market. Therefore, the wide application of blockchain technology in the financial sector has an indirect impact on the real economy. 2. Blockchain technology is a bridge between reality (entity) and virtuality. Through blockchain technology, the real world can be recreated, reconstructed and redefined in the virtual world. For example, real paper money is in digital currency in the virtual world, real stock trading is in digital trading in the virtual world, and real import and export trade is in digital settlement, digital customs clearance, digital documents and bills in the virtual world, which can greatly improve the efficiency of business processes and save transaction costs. At present, all transactions are inseparable from banks, which play a central role in transactions. The application of blockchain technology by banks will definitely improve the efficiency of their settlement and indirectly promote the efficiency of the real economy, but this influence will gradually weaken in the future. Because the biggest feature of blockchain technology is decentralization, its distributed accounting system is a decentralized network system. 3. The application of blockchain technology is actually to value and credit the information flowing on the Internet at present, and to reorganize and reconstruct the information (use value, exchange value and cultural value) in the Internet through blockchain to form a value Internet, which is of great significance and will bring revolutionary promotion to both the financial industry and the real economy.