A debugging device includes a plurality of debug units, a UART port, and a processor. The debugging device is communicated with an electronic device through the UART port. The processor can receive debug signals from the terminal through the UART port, generate a plurality of debug controlling commands based on the debug signals, and send the plurality of debug controlling commands to the plurality of debug units, for controlling the plurality of debug units to debug the electronic device according to the plurality of debug controlling commands.