With the construction of ubiquitous power internet of things, there will be more free bilateral energy trading in the future. In the centralized electricity trading mode, the mutual trust of market participants is insufficient, and the data security is not enough. Consortium blockchain is expected to solve these problems. This paper proposes a power trading method based on consortium blockchain technology to ensure high transparency, traceability and irreversible modification of power trading. The regulatory authority of the trading center is retained, the security check of the dispatching center and the power transmission of the power grid are integrated into the power transaction, and the system application feasibility is improved. Finally, a multi-party cooperative game trading scenario is designed, and a single power demand can be completed by multiple power generation parties. It is conducive to the flexible adjustment of trading power and the increase of cooperation revenue, avoiding the hidden dangers that a single power generator cannot meet the excessive power demand within a specified time. It provides new ideas for establishing of a weak centralized power trading model for the power market. This work is supported by National Key Research and Development Program of China (No. 2017YFB1201002).