A packet fragment processing method, comprising: receiving, by a network device, a first packet fragment set from first user equipment, wherein the first packet fragment set comprises a plurality of packet fragments; and sending, by the network device, the first packet fragment set to a server; characterized by further comprising: receiving, by the network device, a second packet fragment set from second user equipment, wherein the second packet fragment set comprises a plurality of packet fragments; storing, by the network device, the second packet fragment set in an on-chip memory, wherein the on-chip memory and a processor of the network device are disposed on a same chip; reassembling, by the network device, the second packet fragment set stored in the on-chip memory, to generate a second packet, wherein the second packet comprises the second packet fragment set; and receiving, by the network device, a third packet fragment set from the first user equipment, wherein the third packet fragment set comprises a plurality of packet fragments; receiving, by the network device, a fourth packet fragment set from the first user equipment, wherein the fourth packet fragment set comprises a plurality of packet fragments; sending, by the network device, the fourth packet fragment set to the server, wherein the fourth packet fragment set is a packet fragment set preceding the third packet fragment set; and when the network device determines that the server has reassembled the fourth packet fragment set to generate a fourth packet, reassembling, by the network device, the third packet fragment set, to generate a third packet, wherein the third packet comprises the third packet fragment set, and the fourth packet comprises the fourth packet fragment set. receiving, by a network device, a first packet fragment set from first user equipment, wherein the first packet fragment set comprises a plurality of packet fragments; and sending, by the network device, the first packet fragment set to a server; characterized by further comprising: receiving, by the network device, a second packet fragment set from second user equipment, wherein the second packet fragment set comprises a plurality of packet fragments; storing, by the network device, the second packet fragment set in an on-chip memory, wherein the on-chip memory and a processor of the network device are disposed on a same chip; reassembling, by the network device, the second packet fragment set stored in the on-chip memory, to generate a second packet, wherein the second packet comprises the second packet fragment set; and receiving, by the network device, a third packet fragment set from the first user equipment, wherein the third packet fragment set comprises a plurality of packet fragments; receiving, by the network device, a fourth packet fragment set from the first user equipment, wherein the fourth packet fragment set comprises a plurality of packet fragments; sending, by the network device, the fourth packet fragment set to the server, wherein the fourth packet fragment set is a packet fragment set preceding the third packet fragment set; and when the network device determines that the server has reassembled the fourth packet fragment set to generate a fourth packet, reassembling, by the network device, the third packet fragment set, to generate a third packet, wherein the third packet comprises the third packet fragment set, and the fourth packet comprises the fourth packet fragment set. receiving, by the network device, a second packet fragment set from second user equipment, wherein the second packet fragment set comprises a plurality of packet fragments; storing, by the network device, the second packet fragment set in an on-chip memory, wherein the on-chip memory and a processor of the network device are disposed on a same chip; reassembling, by the network device, the second packet fragment set stored in the on-chip memory, to generate a second packet, wherein the second packet comprises the second packet fragment set; and receiving, by the network device, a third packet fragment set from the first user equipment, wherein the third packet fragment set comprises a plurality of packet fragments; receiving, by the network device, a fourth packet fragment set from the first user equipment, wherein the fourth packet fragment set comprises a plurality of packet fragments; sending, by the network device, the fourth packet fragment set to the server, wherein the fourth packet fragment set is a packet fragment set preceding the third packet fragment set; and when the network device determines that the server has reassembled the fourth packet fragment set to generate a fourth packet, reassembling, by the network device, the third packet fragment set, to generate a third packet, wherein the third packet comprises the third packet fragment set, and the fourth packet comprises the fourth packet fragment set.