PURPOSE: In preparing an acidic milky drink containing a specific amount of fatless milk solid matter, using a stabilizer, to prepare an acidic milky drink having improved turbidity, showing no precipitate, having improved stability, by adding citric acid to it in a specific temperature range.

CONSTITUTION: Skim powdered milk, skim milk, or de-fatted condensed milk containing sugar is used to give 0.05W2wt% final concentration calculated as fatless milk solid matter, and it is dissolved and blended with a stabilizer such as cellulose sodium glycolate, propylene glycol alginate, pectin, etc. to give 0.1W1wt% final concentration. The blended solution is heated to 50W100°C, at this temperature an acidic substance such as citric acid, lactic acid, phosphoric acid, etc. directly or in a solution with a proper concentration is added to the blended solution to give 0.1W2wt% final concentration. The prepared acidic milky drink has improved turbidity and no precipitate.