A block-chain-based tax management method according to an embodiment of the present invention includes: according to a transaction request from a user device, at least one block-chain server among a plurality of block-chain servers recording transaction information in a first block; transmitting, by a block chain server corresponding to a receiver of the transaction request among the at least one block chain server, the transaction information to a corresponding service providing server, and the service providing server recording the transaction information in a database; paying, by the service providing server, a tax in response to the transaction information, and transmitting tax information on the paid tax to a block chain server corresponding to a receiver of the transaction request; and generating, by a blockchain server corresponding to the recipient of the transaction request, by linking the second block in which the tax information is recorded to the first block.
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