Data transmission method and related device

The invention discloses a data transmission method and a related device thereof, which are applied to the field of communication. Comprising the steps that a target message which is sent by first communication equipment and used for accessing second communication equipment through an application program is received, the target message carries a target identifier, a source IP address and a target IP address, the target identifier comprises a user identifier and an application identifier, and the target identifier, the source IP address and the target IP address are sent to a core network; and receiving a forwarding strategy sent by the core network, the forwarding strategy being obtained by the core network based on the target identifier, the source IP address and the destination IP address, the forwarding strategy being used for controlling the performance of forwarding the target message to meet the QoS demand, and sending the target message based on the forwarding strategy. The method can identify that a single user needs to realize end-to-end QoS access to establish QoS connection in real time to meet the SLA requirement when using an application program, can realize that the QoS connection is established and disassembled at any time, and saves network resources.