This application provides a server and a debugging method therefor. The debugging method for a server includes receiving, by a complex programmable logic device (CPLD), a control signal generated by a switching member, and generating a switching signal; and switching, by a bus switch, a communication connection of a communications port to a debug port or a Serial Over LAN port of a baseboard management controller (BMC) based on the switching signal. In this way, debugging work is completed or industrial control application information is received at the communications port.