The invention belongs to the field of bath products and particularly relates to tea saponin shower gel and a preparation method thereof. The tea saponin shower gel is made from, by weight, 15-20 partsof tea saponin, 1-3 parts of white mulberry root-bark, 1-3 parts of perilla herb extract, 0.2-1.5 parts of pomelo leaf extract, 3-8 parts of glycereth-26, 1-3 parts of ethylene glycol distearate, 3-5parts of cocamidopropyl betaine, 0.5-5 parts of citric acid, and 50-80 parts of deionized water. The tea saponin shower gel is mainly made with the tea saponin that is a natural plant active ingredient, has the effects, such as foaming to remove dirt, resisting bacteria, relieving itching and wetting, has mild performance, is easy to biodegrade and less irritating to skin, is good for human health, is free of carcinogens, such as dioxane, and organics harmful to human, such as benzene and phenol, and is good in safety and environmental friendliness and free of environmental pollution.