The invention discloses a patch for treating miocardial 
infarction, which comprises the following components according to the parts by weight: 5-10 parts of safflower, 3-10 parts of peach kernel and 3-10 parts of trogopterus dung. A method for preparing the patch comprises the following steps: the raw materials are uniformly mixed and ground according to a proportion, and the grain 
diameter of each component is between 100 microns and 200 microns; CO2 
supercritical fluid extraction is adopted, and a fractionating 
tower is used for fractionating and obtaining required fractions; after all components in the formula are processed through nanometer disperse equipment, the components are prepared into a nanometer medicinal 
slurry according to the proportion of the formula; required 
skin penetration enhancers and pressure-sensitive 
adhesive are added; the obtained mixture enters a spiral low-temperature 
drying and 
coating machine; and after 
coating, processes of 
cutting, quality inspection, packaging and storage are carried out. A 
scientific method is used for 
processing and extracting medicinal materials and filling the medicinal materials in a skeleton of a matrix, and the compatibility of the matrix of the patch with 
skin is good and beneficial to 
drug molecules to pass through, thus the patch has stable medicinal property and the characteristics of quick 
percutaneous absorption, good air permeability, gradual 
medicine release, and the like. Compared with an oral formulation, the patch has no intestinal tract 
first pass effect, is not influenced by the degradation of gastrointestinal tracts and has high 
bioavailability, convenient use, accurate dosage and fixed absorption area and the advantages of long-term action, 
skin absorption and convenient carrying and use.