The invention relates to a water-soluble ginkgo leaf extract and its preparation technology, The method of the invention comprises: taking common ginkgo biloba as a raw material, mixing with acetone and extracting, concentrating, diluting by adding water, cryoprecipitating, filtering, performing a gradient elution to a filtrate through macroporous adsorption resin, carrying out an alcohol precipitation by ethanol with high purity, water extraction and cryoprecipitating, concentrating, drying to obtain the water-soluble ginkgo leaf extract, wherein the content of total flavonol glycoside is greater than or equal to 27%; the content of lactone content is 9%-12%, wherein the content of Terpene Lactones A is greater than or equal to 2.1%, the content of Terpene Lactones B is greater than or equal to 0.9%, the content of Terpene Lactones C is greater than or equal to 1.2%, and the lactone ratio of GA:GB:GC is close to 7:3:4; the water-solubility is greater than and equal to 10%; the ginkgolic acid is less than and equal to 1ppm, which can be taken as a raw material used for injection. The invention has the advantages of simple production technology, high and stable product quality, high finished product yield, low cost and good economic benefit.