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• Coupling analysis of blockchain technology and electricity trading. • Multi-microgrid transaction model based on blockchain. • Using ant colony algorithm to solve multi-microgrid power market transaction model to obtain local optimal electricity price. • Establish a detailed solution process for multi-microgrid power transactions based on blockchain technology. As a new distributed generation system, multi-microgrid is an important part of Energy Internet. There are a series of problems in the selection of generation resources and power trading which includes obvious concentration, fairness and low credibility. Aiming at the shortcomings of microgrid in real-time electricity trade, a multi-microgrid electricity bidding trading model based on blockchain technology is proposed. A competitive spot market with distributed "multi-seller and multi-buyer" is constructed to realize the integration of "source-sale". This paper compares the traditional trading mode with the power trading mode supported by blockchain technology. In addition, this paper establishes a blockchain-based multi-microgrid power trading model, and uses ant colony algorithm random bidding matching to achieve multi-objective optimization. Through the whole process, the unification of energy flow, information flow and currency flow are realized. Finally, the reasonable allocation of power resources and the openness and transparency of power trading are ensured. [ABSTRACT FROM AUTHOR]