The invention provides a Chinese medicinal preparation made from Jasminum lanceolarium for treating gynecological diseases particularly acute and chronic pelvic inflammatory disease, pelvic inflammatory mass, acute and chronic mastitis, hyperplasia of mammary glands, cervicitis and ovarian cyst, and a preparation method thereof. The preparation method comprises the following steps of: cleaning Jasminum lanceolarium, sun drying, slicing to slices of thickness 1-2 cm, extracting with 1,500 mL water for 2 hrs at 100 DEG C under pressure less than or equal to 0.1 MPa, filtering, extracting with 1,000 mL water for 1.5 h at 100 DEG C under pressure less than or equal to 0.1 MPa, filtering, mixing filtrates, vacuum concentrating under vacuum degree of -0.05-0.08 Mpa, temperature of less than and equal to 110 DEG C, and vapor pressure of 0.1 MPa to obtain 1,000 mL filtrate, adding 5% methyl p-hydroxybenzoate alcoholic solution 100 mL, stirring, and bottling. The preparation has the advantages of short treatment course, good therapeutic effect, no toxicity, no adverse side effects, convenience for carrying, and good taste. In addition, the women in lactation period and gestational period can also use the preparation.