Decumbent corydalis tuber eye drop and preparation method thereof

The invention relates to a decumbent corydalis tuber eye drop and a preparation method thereof. According to the decumbent corydalis tuber eye drop, the pH value is 4.6 to 6.5, and the permeation pressure is between 0.24 and 0.360 smol/kg; each 1,000 milliliters of decumbent corydalis tuber eye drop is prepared from the following substances: a decumbent corydalis tuber extract containing 0.32 to 0.43 gram of protopine, 0.0036 to 0.0048 mol of diluted phosphoric acid solution, and 0.1 to 3.0 grams of sodium dihydrogen phosphate, 3 to 8 grams of solubilizer, 0.2 to 0.8 gram of disodium edentate, 0.1 to 0.8 gram of bacteriostatic agent, 0 to 2.0 grams of thickening agent, 0 to 4 grams of medicinal ethanol solution of freshener, disodium hydrogen phosphate and glycerol which serve as auxiliary materials and the balance of water for injection, wherein the concentration of the diluted phosphoric acid solution is less than or equal to 0.5 mol/L, and a mass ratio of the freshener to medicinalethanol is 1:(1-15); the