Abstract: Blockchain is the first network technology to change production relations. Based on trust and security, blockchain technology carries value exchange through tokens, thereby changing production relations, which also has earth-shaking changes in the power sector. Power big data is an important asset of power grid enterprises, and blockchain technology has spawned a new data sharing model, driving a wave of power sharing economy. Firstly, this paper briefly introduces the blockchain technology, analyzes the core technology and characteristics of blockchain, and expounds the application value of blockchain. Then, it explains the power sharing economy, and expounds it from the structure and different scenarios. Finally, the application scheme of blockchain in power sharing economy is proposed, which provides new ideas and feasible directions for the research and application development of blockchain technology in power industry.