In order to explore the influence of water temperature and soil temperature on the water and heat transfer of sand mulched soil under the condition of drip irrigation, a numerical model of water and heat transfer of soil with different water and soil temperature was built based on HYDRUS-2D, and the influence of different water and soil temperature on the dynamic change of water and temperature of sand mulched soil was simulated and analyzed. The results showed that the irrigation water temperature has a significant effect on the distribution of soil water and heat. With the increase of temperature, the moisture content in the soil decreased, which shows that the water temperature of 35 ℃<20 ℃<5 ℃. The irrigation water temperature also had a great influence on the distribution of soil profile temperature, and the temperature changed 5~10 ℃ in the range of 0—15 cm in the surface layer. Under the same water temperature, with the increase of soil temperature, the saturated hydraulic conductivity of the soil increased, and the volume moisture content of the wet soil decreased, which showd that the soil temperature of 30 ℃ < 15 ℃ < 5 ℃. The migration distance of horizontal and vertical wetting front of drip irrigation increased with the increase of temperature. The migration distance and time of wetting front accorded with the power function F=at^b, and the determination coefficient R² was between 0.977 4 and 0.999 6. We established the relationship model between the migration distance of horizontal and vertical wetting front and infiltration time and temperature, in order to provide theoretical guidance for the reasonable supplement irrigation of the sand and gravel mulched ecological agriculture in the arid area of Northwest China.