KYC anti-money laundering method and device circularly written into block chain, equipment and medium

The invention relates to a KYC anti-money laundering method and device circularly written into block chain, equipment and medium, and aims to solve the problem of high cost spent on understanding a client rule, the KYC anti-money laundering method for circularly writing in the block chain comprises the following steps: obtaining user identity information, and storing the user identity informationinto a third-party database through the block chain; if the user transaction information is obtained, obtaining the user identity information from the third-party database; Verifying the user identityinformation, and if the verification is passed, responding to the user transaction information; and after the transaction corresponding to the user transaction information is completed, writing the user transaction information into the block chain, and storing the user transaction information into the third-party database. The method has the effect of saving the cost for understanding the clientrule; and meanwhile, after