The invention relates to a liquid dressing for treating hemorrhoids, and a preparation method thereof. The liquid dressing is prepared from the following components: alginate, modified chitosan, allantoin, tetracaine hydrochloride, glycerinum, hyaluronic acid, human collagen, growth factor, polyethylene glycol, didecyl dimethyl ammonium chloride, phmg, N-isopropyl acrylamide, and the like. The dressing is used for improving bleeding pain, porta hepatis fall-swell and other syndromes caused by internal hemorrhoid, external hemorrhoid, mixed hemorrhoid, anal fissure, anal fistula surgery, promoting hemorrhoid reduction, preventing hemorrhoid prolapse, relieving the syndromes of prolapsed and hemorrhoids congestion and the like, and performing treatment and anti-bacterial nursing of porta hepatis diseases of hemorrhoids and the like.