Method and device for processing user data

An embodiment of the invention provides a method and device for processing user data. The method applicable to optional network nodes of a block chain network includes: receiving an export request, which transmitted by a user through a first client, through a first appointed interface, wherein the export request relates to a first account for exporting the first user reputation account of the user in the first client to the block chain network; broadcasting the export request among other network nodes of the block chain network; responding to confirmation of the other network nodes to the export request to transfer the first user reputation account to the first account of the block chain network. By the method, the user reputation account does not stay on a server side to become garbage data, the user reputation account can be freely transferred among accounts of the block chain network, damage to user benefits is avoided even if the service of the server side corresponding to the client stops, and good user experience is achieved.