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The present invention refers to ethylbenzene for producing styrene dehydrogenation of a Pd-based noble metal catalyst and method relates to more specifically [...] ones of catalyst compounds having a structure manufacturing method using 100-400 °C is the temperature relatively low than benzene dehydration digesting ethyl in said method and method for producing styrene by produced by relates polystyrene. Styrene manufacturing method of the present invention of ethylbenzene excrement into the conventional safety device for use when dehydrogenation of a hydrocarbon catalyst contains no steel preproducts selection used for the dehydrogenation of a pigmented or noble metal catalyst-based Pd said Pd-based noble metal catalyst while utilizing said noble metal catalyst and synergic a new effect intake port is heated by managing users catalyst of water vapor which eliminate the need of use as a dilution, existing steel preproducts dependent re- catalyst contains no under ethylbenzene dehydrogenation of a method for producing styrene in at a temperature lower than the produced by applying ultraviolet rays with 300 styrene, the present invention refers to a cost aspect as well as practice to simplify process for preparation of styrenes the first as well as side opposite to the first side in good yield styrene by dehydrogenation of ethylbenzene a method for preparing the. length.