The invention discloses ear drops for treating acute suppurative otitis media and a preparation method, and belongs to the technical field of medicine. The ear drops are prepared from broadleaf holly leaves, crepis rigescens, Chinese mosla herb, donax, souliea vaginata, the seed of Chinese dodder, cottonrose hibiscus, encephalon passeris, martianus dermestoides, the root of Indian abutilon, the root of kudzu vine, amur barberry root and branchlet, chloramphenicol ear drops, oxymetazoline, iodine glycerin and crotamiton. The ear drops have the treatment principle of killing germs, diminishing inflammation, stopping pain and expelling pus, a composition for clearing away heat and toxic materials, relieving swelling and pain, stopping bleeding and cooling blood is selected, traditional Chinese medicine and western medicine combined preparation is achieved, the traditional Chinese medicine effect and western medicine effect are improved at the largest efficiency, the complementary and improving effect is achieved, the medical effect is improved, the ear drops can be attached to cell walls of germs to change permeability, enzyme, coenzyme and metabolic intermediates in germs are exposed outwards, mycoprotein is degenerated, and therefore a sterilization effect is achieved. The ear drops are wide in action range, capable of acting rapidly, strong in effect and extremely good in effect on treating acute suppurative otitis media.