The invention discloses a method for preparing plant type liquid mosquito incense. The method comprises the following steps: grinding the following components in parts by weight: 30-40 parts of argy wormwood leaf, 20-25 parts of pyrethrum, 15-25 parts of citronella, 11-16 parts of camphorwood, 7-14 parts of stigma croci, 3-8 parts of eaglewood, 10-15 parts of radix angelicae, 2-5 parts of aloe and 3-6 parts of elm bark, adding 150-200 parts of water, decocting at the temperature of 60-70 DEG C for 3.5-5.5 hours, filtering, decocting the filtrate at the temperature of 100-110 DEG C for 0.5-1.5 hours to obtain a concentrated solution, namely the plant type liquid mosquito incense. The method has the beneficial effects that the used components are natural plants and are slightly harmful to a human body; according to the plant type liquid mosquito incense, the components such as the argy wormwood leaf, the pyrethrum and the citronella are effectively combined, and the mosquito incense has a good effect of killing mosquitoes; the plant type liquid mosquito incense is low in cost and suitable for large-scale production.