A blockchain-based tax management method according to the present invention comprises: a step in which at least one blockchain server among a plurality of blockchain servers records transaction information in a first block in response to a transaction request from a user device; a step in which a blockchain server corresponding to a receiver of the transaction request among the at least one blockchain server transmits the transaction information to a corresponding service-providing server, and the service-providing server records the transaction information in a database; a step in which the service-providing server pays a tax in correspondence to the transaction information, and transmits tax information pertaining to the paid tax to a blockchain server corresponding to the receiver of the transaction request; and a step in which the blockchain server corresponding to the receiver of the transaction request generates a second block in which the tax information is recorded in connection with the first block.
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