The invention discloses a steel wire rope composite sisal hemp rope core for an elevator and a preparation method thereof. The steel wire rope composite sisal hemp rope core is prepared by using sisalhemp, aramid fibers and a stainless steel wire as raw materials for weaving. The composite rope core is prepared by multiple times of twisting 3-6 sisal hemp composite core folded yarns, and each sisal hemp composite core folded yarn is formed by a sisal hemp yarn, a palm yarn, and an aramid fiber/stainless steel core covering yarn in a certain proportion. The palm yarn is uniformly distributed in a main core, and the outside of the main core is wrapped by the aramid fiber/stainless steel core covering yarn. The rope core for a steel wire rope is prepared by using the palm yarn and the aramidfiber/stainless steel core covering yarn, defects of the sisal hemp rope core that capacity of storing grease is inadequate, there are many burrs, uniformity is poor, a local part is protruded and the like are solved, and strength of the composite rope core is optimized.