The invention provides an order financing method, device and system based on a block chain, and the invention carries out the accounting of each step of the order financing method based on the block chain, and the method comprises the following steps: receiving the order information transmitted by a client to the block chain, and transmitting the order information to a commerce trade merchant side; receiving the sent purchasing agreement information and the first payment purchasing information input by the steam trade merchant side; after the first payment purchasing information is received, sending vehicle checking information to the logistics company side; receiving order information, vehicle inspection information, logistics information and financing application information input by thelogistics company end, and sending the information to the bank end; receiving financing loan information issued by a bank terminal to the SPV terminal; and receiving fund information input to the bank terminal by the client. According to the invention, omnibearing accounting can be carried out on the order financing process, the whole order life cycle data is recorded on the chain based on the technical characteristics of data tampering difficulty, data traceability and the like of the blockchain, and real and effective data is provided for the order financing business.