The invention discloses a kefir viable type sour milk beverage and a production method thereof. The production method adopts a raw material formula which includes 1000 parts of raw materials: 350-450 parts of raw milk, 0.03-1 part of buffer salt, 3-6 parts of stabilizers, 0.1-120 parts of sweet substances, 2-5 parts of dietary fiber, 5-20 parts of fruit juice, 1-3 parts of acidity regulators, 0.4-0.8 parts of essence, 100-150 DCU of kefir leavening agent Kefir-M, and the balance water; and the production method includes steps: S1: 1) obtaining base materials after the raw milk is homogenized, sterilized, cooled for the first time, inoculated with the leavening agent, fermented, and cooled for the second time; and 2) dissolving the buffer salt in the water, adding a thickening agent, an emulsifying agent, the sweet substances, the dietary fiber and the fruit juice, mixing uniformly, sterilizing and cooling, and obtaining a solution B; and S2: mixing the base materials with the solution B uniformly, adding the acidity regulators and the essence, sterile homogenizing for the second time, cooling and filling. The kefir viable type sour milk beverage is gentle in flavor and stable in state, and has a certain health efficacy.