An aqua-lamp-based candle-like lighting device includes a stand, an aqua-lamp and a seat. The stand and seat are positioned at a bottom and a top of the aqua-lamp respectively. A control circuit, installed inside the stand, has a heating element by resistance from electricity and an illuminator. The aqua-lamp is in a three-dimensional hollow shape of transparent appearance containing a low boiling temperature fluid in a dense state with a bottom adhered to the heating element. The seat is provided with a receiving port for accommodating a candle. Thereby the low boiling temperature fluid is in a flowing state by contacting a heat source and under lighting by the illuminator when electricity is applied to the stand and the heating element is operating by resistance so as to enhance the decorating effectiveness.