Embodiments of the present invention relate to the field of communications technologies and provide a service processing method, device, and system, where service expansion can be performed without changing an original device of an operator. A service processing method includes acquiring business service information corresponding to a to-be-processed service flow, where the business service information includes a service flow identifier of the to-be-processed service flow and a service label corresponding to the service flow identifier. The method includes sending the business service information corresponding to the to-be-processed service flow to a service router, so that the service router processes, according to the business service information, the to-be-processed service flow.