The invention provides a target object tracing method and device. The target object tracing method comprises the steps of acquiring first digital information of a target object, generating identification information of the target object, generating a block chain of the target object according to the identification information of the target object, binding each piece of digital information of the target object in different stages, such as first digital information in a production stage, second digital information in a transportation stage and third digital information in a transaction stage with the block chain, and further being capable of providing each piece of digital information related with the block chain by taking the identification information of the block chain as a query basis, so that each piece of digital information of the target object is acquired through the identification information of the block chain, and thus tracking for production conditions and transaction conditions of the target object is realized according to each piece of digital information of the target object. In addition, when the target object tracing method and device are applied to a transaction scene, information such as the source and quality of the target object can be acquired through each piece of digital information, and both sides of the transaction are enabled to master the same information such as the source and quality of the target object.