The present invention relates to a fermented milk composition containing cellulose ether and a production method thereof, the fermented milk composition includes cellulose ether as a stabilizer for preventing a whey separation phenomenon, and the production method of fermented milk includes manufacturing a fermented base manufacturing a cellulose ether syrup and adding the cellulose ether syrup to the fermented base to perform homogenization and cooling. As described above, in the fermented milk composition, it is possible to provide a fermented milk beverage securing stabilized phase stability and having reduced sourness by applying cellulose ether in a small amount instead of pectin as the stabilizer for preventing the whey separation phenomenon.
