In this paper, aimed at the complicated characteristics, patterns and rules of the future “let go” electricity market, smart contracts of electricity transaction based on the blockchain platform are proposed. Then the key technological difficulties are analyzed and solutions are given. By running a smart contract instance in a peer-to-peer network composed of 4000 nodes, the success rate is 99.38% and the average time consumption for each transaction is proven to be 16s. If our method is applied, we can in the field of electric power market transaction settlement through different systems, reduce the trust of the electric power market transaction cost, reduce the friction in the process of liquidation, improve the efficiency of the clearing and settlement.