The invention discloses a preparation method of an eye patch for treating conjunctival hemorrhage. The preparation method includes the steps that 1, ceramium kondoi Yendo and rhus chinensis Mill. are taken and smashed, water is added for decoction, and then filter liquor is retained for use; 2, thunbergia fragrans Roxb., kelp, dichocarpum auriculatum(Franch.)W.T.Wang et Hsiao, pleurotus ostreatus, pueraria seeds, water shield, common floweringquince fruits, botrychium virginianum and inula racemosa are taken, washed clean, aired, smashed, mixed and then soaked, water is added for decoction, ethyl alcohol is added after standing, centrifugation is carried out, supernatant liquor is taken, ethyl alcohol is recovered, and refined liquor is obtained; 3, the filter liquor obtained in the step 1 and the refined liquor obtained in the step 2 are mixed, vacuum concentration is carried out till the density is 1.3 g / cm<3>, sterilization is carried out, and after 5*6 cm sterile gauze is soaked, the end product eye patch is obtained. The eye patch is reasonable in composition, definite in treatment effect and capable of effectively treating subconjunctival hemorrhage.