The invention provides a multi-interface communication debug tool. The tool comprises a tool body as well as an optical modem, a U port demultiplexer and a network cable demultiplexer, wherein the optical modem is used for signal conversion and transmission and is provided with an optical fiber receiving port and an optical fiber sending port that are connected with an optical fiber, a network port connected with a network cable and an optical modem charging port used for charging the optical modem; the network cable demultiplexer is provided with a transmission port, an input port and an output port, and is used for providing a network port communication function; the U port demultiplexer is electrically connected with the network port of the optical modem and is further provided with a U port and an output end that are connected with a computer; a serial port connected with a debug device is further connected to the output end; and the serial port is connected with a serial port type network cable of the debug device. When in use, interfaces of the computer and the debug device are connected with corresponding interfaces of the multi-interface communication debug tool, so that multi-interface communication debug can be finished.