The invention discloses special aroma enhancing fermenting and clarifying compound powder for late-harvested wine in Sichuan-Tibet plateau and a preparation method of powder. The preparation method comprises the following steps: A, a preparation method of the aroma enhancing fermenting and clarifying compound powder; B, a preparation method of later period fermentation terminating powder; and C, mixing of the aroma enhancing fermenting and clarifying compound powder and the later period fermentation terminating powder in a weight ratio of 5: 2 to 3: 1, and vacuum-packaging in a large scale to obtain the special aroma enhancing fermenting and clarifying compound powder for late-harvested wine in Sichuan-Tibet plateau. The compound powder has multiple functions of quickly starting fermentation in the early period, enhancing aroma and fermenting in the middle period and terminating fermentation and clarifying in the later period. The compound powder can be added at one time in the initial period of fermentation and is convenient and efficient, and the flavor and characteristics of conventional late-harvested wine in Tibetan areas of Sichuan are maintained. By adopting the compound powder, the fermentation time of the late-harvested wine in Tibetan areas of Sichuan is shortened by 20-30% and the production efficiency is improved by 50-80%.