The invention discloses an ophthalmic medicine slowly-releasing carrier with synergetic effect, which is characterized in that the medicine slowly-releasing carrier is bletilla striata gum, the main component of the bletilla striata gum is glucomannan which is polymerized by mannose and glucose at the ratio of 1 to 4; the average molecular weight is from 65000 to 150000, preferentially 100000. bletilla striata gum is accounted as glucomannan with a content being more than 85percent. Cross-linking agent which fulfills the effect of solidification is also added in the bletilla striata gum at the weight ratio of 100 to 0.01-20. The cross-linking agent is formaldehyde, glutaraldehyde, glycol diglycidyl ether, propanediol diglycidyl ether, or butanediol diglycidyl ether. Albumin, gelatin, or gum acacia are also added in the bletilla striata gum. The ophthalmic medicine slowly-releasing carrier of the invention not only can release the medicine slowly, but also has activity for clinically protecting the damaged tissue, preventing tumour, resisting oxidation, inhibiting neovascularization, etc, and has certain synergetic treatment effect on the medicine being carried with better curative effect.