The invention relates to a concrete dam temperature field simulation method, in particular to a concrete dam temperature field simulation method capable of reflecting the daily change of external airtemperature. According to the method, fitting is carried out by adopting an air temperature formula reflecting the daily change of air temperature according to the actually measured air temperature ofa measuring point, and temperature field calculation is carried out after constraint conditions are applied in combination with proposed pouring information, proposed temperature control measures, other boundary conditions, a birth-death method, an equivalent negative temperature difference method and a surface unit material coefficient changing method. Aiming at the problem of concrete dam temperature field calculation, the invention innovatively provides an air temperature fitting function considering the daily change of the air temperature, and the temperature field calculation progress can be further improved.