The invention discloses a method for preparing cold
brewing tea by ice
crystallization treatment. The method comprises the following steps: putting fresh tea leaves in a low-temperature environment below 40 DEG C below zero for ice
crystallization; putting the tea leaves subjected to the ice
crystallization treatment into a vacuum container; slubbing the tea leaves in the vacuum container; heatingthe vacuum container at a
heating temperature of between 70 and 100 DEG C; and stirring the tea leaves in the heated vacuum container until the tea leaves are dried. The ice crystallization process,which is adopted for replacing the conventional withering process, can change the conventional process depending on human experience control into
data control and significantly improve the product consistency; the ice crystallization cooperated with the enzymatic oxidation of vacuum negative pressure
isolated environment oxygen can avoid the problem of peroxided sensitive substances in the tea leaves; the adoption of an ice crystallization wall breaking process combined with
vacuum evaporation dewatering drying can avoid the problem of reoxidation in the
drying process; the tea prepared by theice crystallization wall breaking process has better
solubility in cold water; the cold water
brewing tea prepared by the ice crystallization wall breaking process can improve tea
drinking habits ofhuman beings; and the adoption of the cold water
brewing tea can save a large amount of energy for boiling water. The method can also be used for preparing cold water brewing beverages by using otherplants to conventionally be soaked in water for drinking, such as
ginseng leaves,
ginkgo leaves, chrysanthemums, green plums, olives and the like, thereby providing a new idea for enriching markets.