The invention provides a double-source energy Internet transaction method and device based on a block chain, wherein the method comprises the steps of S10, packaging the data information released by apower generation unit, a heat supply unit and a user into blocks, carrying out the encryption, and transmitting the blocks to each network node; S20, establishing a thermal load dynamic response model and an optimal solution model, and solving an optimal solution of the heat supply model based on the heat supply demand data in the block; S30, establishing an energy internet power optimal scheduling model based on the smart contract game, and solving an optimal solution of the power scheduling model by using the power demand data in the block; and S40, packaging the solved optimal solution data into a block, sending the block to the whole network, and automatically finishing value transfer when the transaction time arrives, so that the relatively closed barriers of different energy sourcessuch as power supply, heat supply and cold supply in a traditional energy source system are broken through, and the comprehensive utilization of multiple energy sources is achieved.