The invention discloses a suspension concentrate containing difenoconazole and a preparation method thereof. The suspension concentrate consists of 40.0 percent of difenoconazole, 8 percent of nonylphenol polyoxyethylene ether sodium phosphate, 0.3 percent of thickener-modified xanthan, 0.5 percent of defoamer 8431, 7.0 percent of glycol antifreeze and the balance of water. In an experiment on low-temperature and hot-storage stability, the appearance of the suspension concentrate is not evidently layered, the dispersibility in water is good, each index measures up to the related standards of suspension concentrate, and moreover, an experiment on the efficacy proves that the suspension concentrate has a good control effect on sigatoka. Since the suspension concentrate adopts water as dispersing medium, the suspension concentrate cannot cause the problems of flammability and pesticide hazard due to organic solvent. The dispersibility and spreadability of the suspension concentrate are good, the suspensibility is high, the suspension concentrate can be firmly attached on the surface of the plant body, and can resist the scouring of rainwater, consequently, the efficacy is more remarkable and durable than wettable powder, meanwhile, the natural environment can be better protected, and the damage of the environment can be reduced. The invention has the advantages of low production cost, feasible technique, environment-friendliness, no pollution and excellent application performance.