The invention relates to a cilostazol oral solid medicine composition. Through research, the inventor obtains an improved cilostazo solid dispersion preparation process and an improved cilostazo soliddispersion with high water solubility as well. In addition, low substituted hydroxypropyl cellulose (of which the water content is less than 5%) of a low water content is selected as a disintegrant of a solid preparation, and the overall water content of the preparation is effectively reduced while a disintegration function is brought into play, so that disintegration caused by the situation thatmoisture in the preparation is absorbed by a raw material medicine can be inhibited. Finally, cilostazol is prepared into a common oral solid preparation. Tests show that the dissolution behavior ofa cilostazol oral solid preparation prepared by using the technique is remarkably improved, and furthermore, the bioavailability of the preparation can be also improved. Meanwhile, because of a low overall water content of auxiliary materials, degradation impurities caused by hydrolysis, of the raw material medicine, can be inhibited, the stability can be improved, and the preparation is simple inprocess, controllable in quality and applicable to industrial production.