Method, device and system for controlling service transmission

Provided in the embodiments of the present invention are a method, device and system for controlling service transmission. The method comprises: receiving the data message sent by a sending end; sending a classification request message to a server, wherein the classification request message comprises L34 layer information of the service extracted from the data message; receiving a classification response message sent by the server, wherein the classification response message comprises service control information determined by the server on the basis of the L34 layer information; controlling the service transmission according to the control information. Through the server configured external to the gateway device, the control information of the service is determined. According to the control information, the gateway device controls the service transmission. Therefore the control of all service comprising non-browser and encrypted service is able to be implemented, the influence on the gateway device performance caused by the configuration of L34 filter is reduced, the persistent data updating of the black-list and the white-list is maintained, and the workload of network maintenance is reduced.