The invention relates to a sleep-aid natural rubber latex pillow interior which is prepared from natural rubber latex, agilawood essential oil microcapsules and the like. A preparation method of the pillow interior includes the steps: dissolving agilawood essential oil in microcapsule materials, and performing emulsification, condensation, solidification and spray drying to obtain microcapsules; adding the microcapsules into natural rubber latex, performing mixing and bubbling to obtain uniform foam; pouring the uniform foam into pillow mold to perform solidifying and forming. According to thepillow interior, natural plant essential oil is embedded into the capsules and mixed with the natural rubber latex, the outer walls of the microcapsules can have a protection function and a slow release function, so that the stability of effective components in the natural plant essential oil can be improved, volatile components in the natural plant essential oil are protected, and overall comfort and efficacy health care duration of a natural rubber latex pillow in later use process are improved.