The invention relates to food and biological medicine industries, in particular to a food. The invention particularly relates to hydroxypropyl trimethyl ammonium chloride chitosan - carboxyl polysaccharide composite salt and a preparation method and application. The hydroxypropyl trimethyl ammonium chloride chitosan - carboxyl polysaccharide composite salt is shown as a formula (1) : the reaction process is simple, the conditions are mild, reaction materials are cheap and easily available, and industrialized application, and researches prove, hydroxypropyl trimethyl ammonium chloride chitosan - carboxyl polysaccharide composite brine is good, and has excellent moisture absorption and moisturizing activity, and has excellent moisture absorption and moisturizing activity. Can extensively be applied to cosmetics field and medicine trade. Formula (1) Formula (1).
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