The invention provides a block chain data 
rollback processing method and 
system, and the method comprises the steps: firstly detecting and verifying the newly-added 
business data of a user, writing the newly-added 
business data into a preset 
database, verifying whether the 
business data is abnormal or not in the writing process, transmitting the business data to a 
verification node for confirmation, and writing a block confirmed by the 
verification node into a block chain; if the block chain is abnormal, the 
consensus node generating and sending a data 
rollback request to the 
consensus leader node for 
verification, and the 
consensus leader node generating a data 
rollback structural body, signing the data rollback structural body and sending the signed data rollback structural body to the block 
chain network; the consensus node receiving and verifying the data rollback structural body, and if the verification is passed, generating a sponsored 
ticket; and the consensus leader node counting the number of sponsored tickets and judging whether 
rollback operation can be carried out or not. According to the block chain data rollback 
processing method and the 
processing system thereof provided by the invention, the risk of 
dirty data problem is reduced, the data rollback of the block chain is conveniently realized, and the user loss caused by rollback can be subjected to insurance compensation.