The invention relates to a konjac glucomannan shower gel and a preparation method thereof. The preparation method comprises the following steps: preparing konjac glucomannan purified powder, preparing a konjac glucomannan sol solution, preparing an active solution, and preparing the konjac glucomannan shower gel. The method uses konjac glucomannan as a matrix and sucrose fatty acid ester as a surfactant, takes advantages of konjac glucomannan, including good water retention property, antibacterial property, gel property, thickening property and emulsifying property, and low cost, and takes advantages of sucrose fatty acid ester, including no toxicity, no harm and good surface property. Cucumber extract, kiwi fruit extract, honeysuckle extract and other vegetal active ingredients are added, so that the product has the effects of nourishing and moistening skin, removing dark spots, keeping water-oil balance, promoting skin metabolism, caring skin and keeping skin white. The product has the advantages of high cleaning capacity, good bactericidal effect, strong moisturizing performance, good anti-aging performance, no stimulation and low carbon content, and is fully-biodegradable and environment-friendly.