This application belongs to the communication field, and discloses a packet transmission method, apparatus, and system, and a storage medium. The method includes: receiving a service request, where the service request includes service information of a terminal device that is to perform access; and determining a first device and a first sliced network based on the service information of the terminal device, where the first sliced network is a sliced network between the first device and a second device, the service request is forwarded by the second device, and the first sliced network is used to transmit a data packet sent by the terminal device. This application can meet a network performance requirement of the terminal device.