The invention belongs to the field of mosquito-repellent incenses, and in particular relates to a nepenthes extract mosquito-repellent liquid and a preparation method thereof. The nepenthes extract mosquito-repellent liquid is prepared from the following raw materials in parts by weight: 110-160 parts of a nepenthes extracting solution, 67-94 parts of a wormwood extracting solution, 33-51 parts of a
lantana camara extract solution, 8-20 parts of a
lavender extract solution, 40-60 parts of deionized water and 30-55 parts of
ethanol. The preparation method comprises the following steps: performing ultrasonic treatment, eccentric treatment, concentration treatment and the like so as to prepare the nepenthes extracting solution, the wormwood extracting solution, the
lantana camara extracting solution and the
lavender extracting solution, mixing the nepenthes extracting solution, the wormwood extracting solution, the
lantana camara extracting solution, the
lavender extracting solution, deionized water and
ethanol, and performing sealed stirring for 3-6 hours at 53-70 DEG C to obtain the nepenthes extract mosquito-repellent liquid. Effective components of the nepenthes extract mosquito-repellent liquid are all extracted from natural traditional Chinese herbal medicines which are relatively low in cost, so that the prepared product is safe and non-toxic and has the effects of killing
bacteria, repelling mosquitoes and helping sleep.