In a system and method for processing network data of a server, the server includes a timer, a switch and a storage system. The server determines whether the storage system includes overtime information of the timer when server is powered on. If the storage system includes the overtime information, the overtime information is deleted. If an operating system is started, a predetermined initial value is written into the timer to start timing, and a first network port and a second network port are disconnected through the switch. If the server works normally, a predetermined reset command is sent to the timer to reset the timer at regular intervals. If the server does not work normally, the first network port and the second network port are connected through the switch. If the timer times out, the overtime information is written into the storage system.