A default quality of service (QoS) control method and device for solving the problem in the prior art that there is no solution for generating a default QoS rule for a NextGen network. In embodiments of the present disclosure, an SMF entity determines a target PCC rule from at least one PCC rule sent by a PCF entity; the SMF entity generates, according to the target PCC rule, a default QoS rule corresponding to a PDU session, and sends the default QoS rule to a UE. According to the embodiments of the present disclosure, because the connectivity and QoS control of the PDU session are ensured, and the target PCC rule used by the SMF to generate the default QoS rule is determined by the PCF entity for a PDU session of the UE, the precise control for a specific UE and a specific PDU session is implemented, and the system performance is further improved.