A virtual COM port for remote I/O controller comprises a virtual COM port in a host end. The virtual COM port is connected to a remote I/O controller via a network, wherein the virtual COM port is adopted for receiving and converting commands or data of a COM port interface transmitted from the host end into an acceptable format for the remote I/O controller, and then transmitting to the remote I/O controller for processing. The virtual COM port is also adopted for receiving and converting commands or data transmitted from the remote I/O controller via the network into an acceptable format for the COM port interface, and then transmitting to the host end for processing.