A link switching method and a link switching device, a network communication system, and a computer-readable storage medium are described. The link switching method includes: monitoring whether a connection state of a first link between a first network device and a second network device is abnormal; and in response to the monitored connection state of the first link being abnormal, sending a pre-configured data packet to the first network device for being invoked by the first network device to perform a link switching from the first link to a second link.