The invention provides a traditional Chinese medicine for relaxing bowels and a preparation method of the traditional Chinese medicine. The traditional Chinese medicine for relaxing bowels is prepared from the following components: herba fibraureae recisae, muskmelon seed, liriope spicata, mulberry, semen trichosanthis, linseed, cassia seed, fructus cannabis, momordica grosvenori, radix scrophulariae, Chinese torreya, black sesame seed, polygonum multiflorum, Chinese angelica, rhizoma anemarrhenae, cistanche, walnut kernel, bunge cherry seed, bitter apricot seed, platycladi seed, aloe, mangnolia officinalis, Chinese radish seed, armeniaca dulcis, fruit of purple perilla and honey. The preparation method of the traditional Chinese medicine comprises the following steps: weighing the raw materials in parts by weight, cleaning and mixing the raw materials, and performing microwave drying on the raw materials for later use; chopping the spare raw materials, adding water into the chopped spare raw materials to decoct for 1-2 hours, filtering, continuously adding water into filter residues to decoct for 1-2 hours, combining the filtrate twice, concentrating and naturally cooling; adding honey into the filtrate, uniformly stirring, performing ultraviolet sterilization and sub-packaging to obtain the traditional Chinese medicine. According to the principle of monarch, minister, assistant and guide, the traditional Chinese medicine can be used for keeping electrolyte balance in the gastrointestinal tract while producing effects of relaxing bowels.