The invention provides a ready-to-drink Puer tea and the preparation method thereof. The method places Puer tea in pulse electrical field for 20 to 50min for 1 to 2 times, with the pulse being controlled at voltage 8-15KV, frequency 3-8Hz, then the Puer tea is extracted by water and an extract is acquired. The Puer tea can be acquired by directly brewing the extract of Puer tea with boiled water,or evenly mixing 90 percent to 100 percent Puer tea extract, 0 to 10 percent flower extract and 0 to 10 percent Oolong tea and brewing the mixture with boiled water. The invention can effectively eliminate the special stale flavor of Puer tea, improve the original mellow and preserve the intrinsic health care functions such as clearing away heat and toxic materials, quenching the thirst and helping producing saliva, strengthening and warming the stomach, refreshment, lipid regulation and weight reduction, cancer prevention and resistance, anti-aging, improving immunizing ability, antioxidation, fatigue prevention, inhibiting bacterium, balancing and regulating cholesterin, etc.; furthermore, the Puer tea has the advantages of being easy to be drunk and carried, sanitary, mellow taste, bloom and clear soup color, which is a good household and outgoing carried tea drinking.