Disclosed in embodiments of the present invention are a packet forwarding method, device and system. In a forwarding network comprising a controller, a user side LB, a vBNG and a network side LB, when the network side LB receives a first packet forwarded by a network side to a target terminal of a user side, by matching the first packet's target identifier used for identifying the target terminal to a first sharing entry, a pre-planned forwarding path from a first output port of the network side LB to a first forwarding unit for processing the online of the target terminal can be determined, so the first packet sent to the target terminal can be precisely forwarded to the first forwarding unit for processing the online of the target terminal, thereby avoiding that the packet forwarded from the network side to the user side may be forwarded to an improper forwarding unit in the vBNG, thereby reducing situations in which packets received from the network side need to forwarded across VMs in the vBNG, and ensuring forwarding performance of the vBNG.