The invention provides a trichoderma viride fermentation method and a water dispersible granule thereof, and relates to the field of microbial pesticides. The trichoderma viride fermentation method comprises the following steps: inoculating trichoderma viride LTR-2 to a fermentation culture medium, controlling the temperature at 29-31 DEG C at the early stage of the fermentation, and controlling the temperature at 24-26 DEG C and the pH value at 5.0-5.5 at the late stage of the fermentation; obtaining a trichoderma viride LTR-2 fermentation liquor rich in chlamydospores. By adopting the method, the trichoderma viride fermentation liquor rich in chlamydospores can be obtained, the stress resistance of the product is obviously improved, and the shelf life is prolonged; The effect of the water dispersible granule on controlling tomato gray mold, potato late blight and tobacco powdery mildew is obviously superior to that of a control medicament and agricultural preparation DZ-1.