The invention discloses a dual-fermentation milk beverage and a making method thereof. The making method comprises the following steps of S1, performing homogenizing on raw milk, performing sterilizing, performing cooling, then performing inoculating with a fermenting agent, and after performing fermentation, performing cooling once again so as to obtain a fermentation base material; S2, sterilizing a fruit and vegetable juice mixed solution containing ingredients, performing cooling, then performing inoculating with a fermenting agent, and after fermentation, performing cooling once again soas to obtain fermented fruit and vegetable juice; S3, uniformly mixing a stabilizing agent with a sweetening agent and an emulsifying agent, performing sterilization, and performing cooling so as to obtain an added solution; and S4, uniformly mixing the fermented base material obtained in S1, with the fermented fruit and vegetable juice obtained in S2 and the added solution obtained in S3, adjusting the acid, performing homogenizing and performing sterilizing so as to obtain the dual-fermentation milk beverage. The dual-fermentation milk beverage made by the method disclosed by the invention is stable in system, has long quality guarantee period under normal temperature, besides, contains the flavor of fermented milk and the flavor of fermented fruit juice, is smooth, refreshing and delicate in mouth feel, and good in nutrient and health, fills a blank that the dual-fermentation milk beverage does not exist in the market at present, and also solves the difficult problem that the fruitjuice is applied to milk products.