A Slow Protocol packet processing method, wherein the method comprises: receiving, by a network device, a first Slow Protocol packet, wherein the first Slow Protocol packet carries device information of a transmit end device of the first Slow Protocol packet; determining, by the network device based on port information of a port of the network device receiving the first Slow Protocol packet, that a negotiation process is already completed between the network device and the transmit end device, and querying, based on the device information of the transmit end device carried in the first Slow Protocol packet, whether a device information base stored by the network device in the negotiation process comprises the device information of the transmit end device; and identifying, by the network device, the first Slow Protocol packet as a valid packet in response to a result that the device information base comprises the device information of the transmit end device; characterized in that before the receiving, by a network device, a first Slow Protocol packet, the method further comprises: receiving, by the network device, a second Slow Protocol packet, wherein the second Slow Protocol packet carries device information of a transmit end device of the second Slow Protocol packet, and the second Slow Protocol packet is a negotiation packet; and determining, by the network device, that a negotiation process is already completed between the network device and the transmit end device of the second Slow Protocol packet, and storing, in the device information base, the device information of the transmit end device carried in the second Slow Protocol packet. receiving, by a network device, a first Slow Protocol packet, wherein the first Slow Protocol packet carries device information of a transmit end device of the first Slow Protocol packet; determining, by the network device based on port information of a port of the network device receiving the first Slow Protocol packet, that a negotiation process is already completed between the network device and the transmit end device, and querying, based on the device information of the transmit end device carried in the first Slow Protocol packet, whether a device information base stored by the network device in the negotiation process comprises the device information of the transmit end device; and identifying, by the network device, the first Slow Protocol packet as a valid packet in response to a result that the device information base comprises the device information of the transmit end device; characterized in that before the receiving, by a network device, a first Slow Protocol packet, the method further comprises: receiving, by the network device, a second Slow Protocol packet, wherein the second Slow Protocol packet carries device information of a transmit end device of the second Slow Protocol packet, and the second Slow Protocol packet is a negotiation packet; and determining, by the network device, that a negotiation process is already completed between the network device and the transmit end device of the second Slow Protocol packet, and storing, in the device information base, the device information of the transmit end device carried in the second Slow Protocol packet. receiving, by the network device, a second Slow Protocol packet, wherein the second Slow Protocol packet carries device information of a transmit end device of the second Slow Protocol packet, and the second Slow Protocol packet is a negotiation packet; and determining, by the network device, that a negotiation process is already completed between the network device and the transmit end device of the second Slow Protocol packet, and storing, in the device information base, the device information of the transmit end device carried in the second Slow Protocol packet.