Method and device for detecting TCP (Transmission Control Protocol) link

The invention relates to a TCP (Transmission Control Protocol) link detection method and device, belongs to the technical field of computer networks, and solves the problems that a large amount of network bandwidth is occupied and abnormity of a physical link, a program and a process cannot be quickly judged due to frequent transmission of detection packets in the conventional heartbeat detection method. The TCP link detection method comprises the steps that in the data transmission process through a main link, three network detection modes are operated on three processors at the same time to judge whether a network is abnormal or not, and the three network detection modes comprise an ifconfig state detection mode, an ICMP data packet detection mode and a heartbeat detection mode; when any one of the three network detection modes judges that the network is abnormal, network abnormal information is returned to the corresponding processor in the three processors; and according to the network abnormal informatio