The invention discloses a medicine for treating phlegm retention obstructing lung type cardiac insufficiency and a preparation method thereof. The raw medicinal materials include fructus arctii, sarmentose pepper herb, cordate houttuynia, rongkol, fagopyrum dibotrys, Japanese balanophora, gynostemma, aster fastigiatus, hippophae rhamnoides, delphinium brunnonianum royle, fritillaria cirrhosa, ligularia lessicotal, trichosanthes kirilowii maxim, fructus broussonetiae, radix peucedani, brackish-water crab, concha meretricis seu cyclinae, sea snails, aster, aristolochia championii, textile screw pine shoot, Japanese ardisia, Japanese inula herb, semen lepidii, holy basil, flos daturae, kohlrabi, thorny elaeagnus leaves, magnets, pennycress seeds, ganoderma lucidum, prickly poppies, polygala and maire yew seeds. The medicine for treating phlegm retention obstructing lung type cardiac insufficiency has the effects of purging the lung of pathogenic fire and reducing phlegm, and mainly treats phlegm retention obstructing lung type cardiac insufficiency, treatment is based on syndrome differentiation through the theory of traditional Chinese medicine, and the medicine is high in targeting performance by adjusting body circulation and pulmonary circulation qi and blood, relieves dyspnea and edema, controls arrhythmia, adjusts blood pressure, strengthens the cardiac pumping function, and has the advantages of taking effects soon, and being high in efficiency, definite in treatment effect, short in treatment course, free of toxic and side effects, low in price and the like.