The invention relates to a blockchain information processing system. The blockchain information processing system comprises nodes, and at least five nodes are connected into a blockchain; each node comprises a transmitting unit, a receiving unit, a verification unit, a link generating unit, a QR (quick response) code generating unit, a QR code identifying unit and a QR code decrypting lock, wherein the transmitting unit is used for transmitting first information to other nodes; when key (210) matched with lock (220) is inserted into the lock (220), the inside of the lock (220) moves to form acorrect first QR code, the QR code scans and identifies the first QR code to transmit the first information of the first link corresponding to the first QR code to the other nodes. Therefore, by transmitting the first information among the nodes of every blockchain, the blockchain information processing system can enhance security of data transmission.