The invention relates to a preparation method of a shower gel. The shower gel provided by the invention is prepared from green and safe surfactants, namely tea saponin and alkyl glycoside, safe and mild surfactants, namely lauramidopropylamine oxide, soap of potassium aliphatate and cationic guar gum, assistants, namely sucrose fatty acid ester (a foam stabilizing and thickening agent) and aloe extraction solution, and other safe assistants, such as ethylenediamine tetraacetic acid disodium salt, a preservative and deionized water. Compared with an existing shower gel product, the shower gel has the advantages of reasonable formula, very rich raw material sources, property of belonging to renewable resources and no toxic or side effects to human bodies, and the shower gel is green, ecological and environment-friendly, and can relieve dry and tight feeling of skin, effectively inhibit itching, nourish and moisturize the skin, enable the skin to be tender, smooth and elastic by long-term use, realize the effects on sterilizing, inhibiting bacteria, diminishing inflammation and relieving itching and realize an auxiliary treatment effect on rash and prickly heat.