The invention provides mosquito repellent water containing green pepper extracts and a preparation method of the mosquito repellent water. The mosquito repellent water is prepared from components in percentage by weight as follows: 1%-5% of plant extract, 40%-75% of ethanol and the balance of deionized water, wherein the plant extract is prepared from raw materials in parts by weight as follows: 25-40 parts of green pepper, 10-20 parts of lavender, 10-20 part of roses, 5-15 parts of wrinkled gianthyssop herbs and 5-15 parts of mint with a method shown as follows: the raw materials are mixed, cleaned, drained, dried and crushed, the crushed powder is added to the deionized water in a material-water ratio and extracted with a microwave-assisted extraction technology, an extracting solution is filtered, and filtrate is the plant extract. The mosquito repellent water has the mosquito repellent effect and further has the efficacy of refreshing, restoring consciousness, cooling, relieving itching, inhibiting and killing bacteria, protecting skin against bite by insects and the like; besides, raw materials of the product are from plants, and the mosquito repellent water is safe, non-toxic and applicable to various crowds and various skin.