A natural tea has effects of relieving hangovers and revitalizing liver functions, contains an extract from natural plant Robinia pseudo-acacia as a main active ingredient, and is obtained under optimal extraction conditions. The natural tea comprises an extract from the leaf, stem, flower and root of Robinia pseudo-acacia as a main active ingredient, and conventional additives, and optionally, at least one selected from Hedyotis diffusa, Amomi semen, Glycyrrhiza and Pueraiae Flos, as a minor active ingredient. Thus, the present invention provides the powder or liquid natural tea comprising the Robinia pseudo-acacia extract as a main active ingredient, and optionally, a given amount of at least one selected from the Hedyotis diffusa, Amomi semen, Glycyrrhiza and Pueraiae Flos extracts, as well as the method for preparing the same. The natural tea according to the present invention shows the effects of relieving hangovers and protecting the liver when taken before or after drinking alcohol. Particularly, according to the present invention, robinine extracted from Robinia pseudo-acacia can be used as a single active ingredient in a hangover relief drink.