The invention discloses a chip achieving method of a PVLAN in a stacked mode. A corresponding VLAN, a first isolating mark number in the output direction and a second isolating mark number in the input direction are distributed to a port of a stacked chip, a forwarding rule of the PVLAN is configured in the stacked chip, after the chip receives a message, the message is processed according to the forwarding rule of the PVLAN, that is, communication is carried out according to the attribute of the PVLAN, and information of the PVLAN can be transmitted in a cross-chip mode. The application range of the PVLAN technology is greatly widened, and application of the PVLAN is more flexible and efficient.