A signal connecting module, an electronic device, and a connector identification method thereof are disclosed. The signal connecting module is applied to the electronic device to electrically connect to the connector. The signal connecting module includes a connecting port, a controlling module, and a detecting module. The controlling module electrically connects to a first pin of the connecting port. When the connector connects to the connecting port, the controlling module outputs a detecting signal via the first pin to an earphone pin of the connector. The detecting module electrically connects to a second pin and a third pin of the connecting port; wherein after the controlling module outputs the detecting signal, the detecting module detects a current signal received by the second pin or the third pin to determine that the second pin or the third pin electrically connects to a ground pin of the connector.