Supply chain data tracing method and device based on block chain technology and processor

The embodiment of the invention provides a supply chain data tracing method and device based on a block chain technology, a processor and a storage medium. The method comprises the following steps: a data user inputs a traceability number of a to-be-queried product on a first block chain, and queries whether corresponding traceability data exists on the first block chain; if yes, obtaining first traceability data on the first block chain; inputting a traceability number on the second block chain through the cross-chain communication infrastructure component, and querying whether corresponding traceability data exists on the second block chain; if yes, the cross-chain communication infrastructure component obtains second traceability data on the second block chain and sends the second traceability data to the data user; calculating the first traceability data and/or the second traceability data to obtain a corresponding first calculation result and/or second calculation result; performing smart contract verifi