One or more embodiments of the specification provide a blockchain-based relationship binding method, apparatus, and device. An exemplary method may include: receiving a user binding request including a binding tag, the binding tag includes (1) a binding type of a binding relationship, and (2) role information of the second user in the binding relationship; sending a confirmation request to a second user; retrieving a relationship table of the second user; in response to the binding type in the user binding request includes a one-to-one binding relationship: determining whether the one or more binding types in the relationship table of the second user include the binding type in the user binding request, and if yes, terminating the method; and generating a record of binding relationship; writing the record of binding relationship into a blockchain; and updating the relationship table in the local database.