An electronic device with a heat-dissipating function and a liquid-cooling radiator module are provided. The electronic device includes a first circuit board, a second circuit board and a liquid-cooling radiator module. The second circuit board is mounted on the first circuit board. The liquid-cooling radiator module is attached on the second circuit board and in thermal contact with an electronic component of the second circuit board. The liquid-cooling radiator module includes plural airflow channels and a fan. The plural airflow channels are in parallel with the second circuit board. The fan produces airflow toward the plural airflow channel. After the airflow passes through the plural airflow channels, the airflow is outputted in a direction parallel with the second circuit board. Since the airflow is not obstructed by the adjacent function circuit boards, the heat-dissipating efficiency is enhanced.