The invention provides an extraction method of a 
periplaneta americana extract for treating 
peptic ulcer, comprising the following steps of:A, crushing, B, soaking, C, extracting, D, primarily concentrating, E, 
degreasing, and F, secondarily concentrating. According to th invention, extraction is carried out by using the method, lots of proteins contained in 
periplaneta Americana can be effectively removed, and the 
degreasing rate is high; and moreover, 90-95% 
ethanol is used for soaking a coarse 
powder, so that preservation time is prolonged, and the yield of specific active ingredients for treating 
peptic ulcer is increased. Due to reasonable control on each process parameter, 
hydrolysis of the active ingredients for treating 
peptic ulcer in the extract can be prevented, and the 
curative effect of the 
medicine can be improved. With the process disclosed by the invention, the extraction method is low in production cost and high in production efficiency. Clinically applicable preparations (tablets, capsules, mixture, oral liquid, 
pellets, dripping pills, spray, 
aerosol, gels and the like) can be prepared by taking the 
periplaneta americana extract obtained by the method disclosed by the invention and adding proper pharmaceutical auxiliary materials, and are used for (oral-administration or spray) treatment for peptic ulcer.