The present invention relates to a syndiotactic polystyrene/clay nano composite material, and is aimed at mainly resolving the technical problem of uniform dispersion of clay in syndiotactic polystyrene base body in nano size and the problem of that the previous preparation technology has the weak interaction between syndiotactic polystyrene base body and inorganic filler interface and poor comprehensive performance of the composite material. Said invention adopts a technical scheme of that firstly, a solution intercalation method is adopted to insert the sulfonated syndiotactic polystyrene into the between of sandwiches of clay with laminated structure to prepare out the sulfonated syndiotactic polystyrene clay nano composite, then the above-mentioned nano composite and syndiotactic polystyrere are melt-mixed and combined so as to resolve the above-mentioned problems.