The invention provides a plant-derived PP master batch, a preparation method and application thereof. According to the method, anti-carbonization additives chitin and starch are added into plant extract powder, and a modified plant extract is obtained after internal mixing of an internal mixer, so that carbonization in the subsequent high-temperature melting process is reduced; and the modified plant extract and PP slices are blended and melted to prepare plant-derived PP master batches, and products containing the modified plant extract, such as polypropylene fibers, films or plastics, are prepared through spinning, injection molding, extrusion, blow molding, thermal forming and other methods. According to the invention, the plant-derived PP master batch is uniform in particle and smoothin surface; the prepared product has the advantages that the mechanical property is reduced, the normal use is not influenced, the functions of fragrance, antisepsis, anti-inflammation, cooling, health care and the like of plants can be realized, the moisture regain of the prepared polypropylene fiber is improved, and the comfort is enhanced.