the present invention provides a vacuum thermoforming process - combined one - step molding method for expandable polypropylene , comprising the steps of silk screen printing on a plastic sheet , subjecting the plastic sheet to vacuum thermoforming to provide a vacuum thermoforming part , and foaming an expandable polypropylene and integratedly molding the expandable polypropylene with the vacuum thermoforming part . the expandable polypropylene vacuum thermoforming product produced by the method according to the present invention exhibits an improved impact resistance , and the production process is more superior .