Block chain-based electric energy transaction method and device, and electric energy transaction system

The invention provides an electric energy transaction method and device based on a block chain and an electric energy transaction system. The photovoltaic users can sell electricity under the condition of sufficient electricity generation and can purchase electricity under the condition of insufficient electricity, so that the photovoltaic users not only can sell electricity, but also can purchase electricity, the situation that transaction is not completed in time under the condition that the electricity of the photovoltaic users is insufficient is avoided, and meanwhile, when the photovoltaic users sell electricity, the electricity can be sold by the photovoltaic users. If economic loss is brought to the flexible load user, that is, electricity is not sold according to the agreement, the photovoltaic user needs to bear default cost, so that the photovoltaic user can be supervised and promoted to improve the credit rating, and the situation of inaccurate transaction completion under the condition that the el