A data packet forwarding method, a network adapter and a host device. The method is applied to a network adapter, the network adapter is connected to a host device, the host device includes a first VM, the first VM includes N vNICs, and the network adapter includes a first VF allocated to the first VM, where N is an integer greater than 1. The method includes: receiving mapping relationship information sent by the host device, where the mapping relationship information is used to indicate a mapping relationship between N queue pairs among queues configured for the first VF and the N vNICs, and each of the N queue pairs is used to forward a data packet of a vNIC corresponding to each queue pair; recording the mapping relationship information in a forwarding information table; and forwarding data packets of the N vNICs according to the mapping relationship information.