Data message processing method and device

The invention relates to a data message processing method and device, and relates to the technical field of wireless communication. The method comprises the following steps: when a policy request message created by a session is received, obtaining feature information of a user terminal from the policy request message; determining a target header enhancement rule according to the feature information of the user terminal; and issuing the target header enhancement rule to a session management function (SMF) network element, so that the SMF network element transmits the target header enhancement rule to a user plane function (UPF) network element, and the UPF network element is used for processing the received data message according to the target header enhancement rule. Thus, authorization and issuing of the header enhancement rule can be realized by using the PCF network element, and the authorization and issuing of the header enhancement rule do not need to be realized through the SMF network element or the UP