The aquaculture of fry and some adult fish such as Chinese high-fin banded sharks has high requirements on water temperature，while long-term，high-power electric auxiliary heat regulation has high energy consumption.The use of pig manure aerobic compost to heat aquaculture water can help to regulate and maintain water temperature，save energy.In order to study the transfer of heat and the process of temperature change of aquaculture water with the waste heat and auxiliary heat from pig manure aerobic composting，a small experimental device with a fermentation tank，a water storage tank and a simulated fish pond as the main body was built.The geometric model of the experimental device was established by using computational fluid dynamics software.The transfer of heat and temperature changes of the model were studied as well.The validation test was carried out by using the small experimental device.During the experimental period，the simulated temperature of 102.9 kg pig manure compost increased by 17.53 ℃ on average，while the measured temperature increased by 14.94 ℃ on average.The simulated temperature of 25.0 kg water storage tank increased by 16.86 ℃ on average，while the measured temperature increased by 11.85 ℃ on average，with the average heat absorption of the water storage tank of 6.22×10⁶ kJ per day.The simulated temperature of 24.0 kg fish pond increased by 13.55 ℃ on average，while the measured temperature increased by 9.42 ℃ on average，with the average heat absorption of the fish pond was 4.75×10⁶ kJ per day.The results showed that the pig manure aerobic composting is feasible for heating the aquaculture water，and the measured and simulated results of temperature change is consistent，verifying the reliability of the model to a certain extent.The mathematical model and verification test provide data support and theoretical basis for heating the aquaculture water by utilizing the waste heat and auxiliary heat from compost.