Monochamus alternatus repellent and preparation method thereof

The invention relates to a monochamus alternatus repellent, which is prepared from the following components in parts by weight: 18 to 30 parts of artemisinin, 3 to 10 parts of 3-carene, 0.01 to 0.05 part of ascaroside C8 and ascaroside C7, 6 to 10 parts of cinnamyl aldehyde, 40 to 50 parts of ethanol, 20 to 30 parts of glacial acetic acid, 3 to 5 parts of cycloene, 2 to 6 parts of eugenol and 100to 200 parts of an azadirachta indica leaf extract. According to the invention, artemisinin is selected as a main medicament, 3-carene, ascaroside C8, ascaroside C7, cinnamyl aldehyde and artemisinincooperate with each other to play a role in repelling forests, and especially, the azadirachta indica leaf extract is added, so that the repellent provided by the invention can greatly cause electrophysiological reaction of antennae of monochamus alternatus female and male adults, and can obviously repel the monochamus alternatus in pinewood, by adopting the concept of biological prevention and treatment, the biological pr