The present invention discloses a data packet processing method and a device. The method includes: receiving, by a capability exposure function device, a first processing policy sent by a third-party application, where the first processing policy includes an external identifier of UE, an identifier of the third-party application, and a processing policy of a data packet sent by the UE to the third-party application; obtaining an internal identifier of the UE based on the external identifier of the UE; determining a second processing policy based on the internal identifier of the UE, where the second processing policy includes the internal identifier of the UE, the identifier of the third-party application, and the processing policy of the data packet; and configuring the second processing policy on a network side, where the second processing policy is used by a network side device to process the data packet.