The invention discloses a medicine for treating qi depression phlegm accumulation type gestational hypertension and a preparation method thereof. The raw medicinal materials in the medicine include Japanese balanophora, dried tangerine peel, delphinium brunnonianum royle, costusroot, rongkol, finger citron, holy basil, citron, textile screw pine shoot, armeniaca mume, margarya melanoide, margarya melanoide, sarmentose pepper herb, semen raphani, ligularia lessicotal, paederia scandens, prickly poppy, semen cassiae, Japanese inula herb, rhizome of spiny lasia spinyelephantsear, ganoderma lucidum, valerian, ligusticum, arabic cowry shell, nux prinsepiae, lemmaphyllum microphyllum, uncaria, adenophora tetraphylla, flowers of l.chinense var.rubrum, fructus broussonetiae and blumea balsamifera. The medicine for treating qi depression phlegm accumulation type gestational hypertension has the effects of strengthening the spleen, regulating qi-flowing for eliminating phlegm, and mainly treating qi depression phlegm accumulation type gestational hypertension, and has the advantages of taking effect soon, and being high in efficiency, definite in curative effect, short in treatment course, free of side effects and the like on the aspect of treating qi depression phlegm accumulation type gestational hypertension.