Application of friedelin as semen cuscutae control agent

The invention discloses an application of friedelin as a semen cuscutae control agent in the field of natural medicine extraction, and the friedelin in mangoes is extracted and is applied to an agent for inhibiting the growth of semen cuscutae. 2 mg/ml to 20 mg/ml of friedelin is sprayed to the semen cuscutae plants respectively; the preparation method of the friedelin medicament comprises the following steps: drying, extracting an extracting solution, preparing an extract, extracting, eluting, crystallizing and filtering. Drying and dehydrating the mango stem tips, and crushing to obtain mango powder; adding the mango powder into methanol, soaking and extracting for 1-3 times for 12-48 hours, and combining extracting solutions; heating and concentrating the extracting solution under reduced pressure to obtain an extractum extract; suspending the extractum extract by using distilled water, and extracting for three times by using the same amount of petroleum ether; and adding a proper amount of silica gel into