The invention discloses a sterilization composite of flutriafol.and tebuconazole, wherein the weight ratio of the flutriafol to the tebuconazole is (1-80):(80-1), perferably (1-40):(40-1), and the optimal weight ratio is (1-20):(20-1). In the composite, the effective active components, namely the flutriafol and the tebuconazole are mixed and matched within a certain range to achieve a good synergistic effect on resisting diseases; and the prevention effect is higher than the that of single dosage, and the application quantity is less, the application cost is reduced, and meanwhile the influence on the environment is reduced, and the composite has specially good effects on powdery mildew, downy mildew and alternaria leaf spots.