This invention is related to an aquaculture heating device. A heating unit is hung on a support rod, so that the support rod can be horizontally placed above an aquaculture and two ends of the support rod can be fixedly positioned on two sides of the aquaculture to let the heating unit hung on the support rod to be dropped and immersed in the water of the aquaculture when winter, especially cold stream, comes. When electricity is provided to conductive yarns of a heating layer of the heating unit, heating filaments of the conductive yarns will generate heat to be transferred to the water and gradually diffused throughout the aqua culture through the waterproof fabric layer. Thus, the water temperature is raised to effectively help the aquatic organisms to resist the cold winter and not to be frozen to death caused by the very low water temperature.
