Abstract: Microgrid distributed power transaction flexibly regulates the distributed energy according to the market supply and demand, realizing the optimal allocation and utilization of resources and highlighting the market value of resources. The characteristics of the blockchain technology, such as its decentralization, tamper prevention and distributed storage, are highly consistent with the decentralized and autonomous characteristics of the distributed power transactions. However, in the scheme designing, the problems such as the leakage of the sensitive data like the transaction prices and the disruption of the market order by malicious bidding have not been solved. This paper, adopting the homomorphic commitment and the verifiable encryption technology, proposes a power bill settlement mechanism that takes into account the privacy prices, designs a transaction price privacy protection scheme based on the blockchain technology, and conducts the strict security proof and simulation tests. The verification and simulation results show that the proposed scheme is able to effectively protect the privacy of the transaction price and meet the needs of the correct settlement and supervision.