The invention discloses a preparation method for an external medicine for nerve post-injury and components of the external medicine. The preparation method for the external medicine for the nerve post-injury comprises the following steps: fetching 10 to 30 parts of solanum lyratum thumb, 6 to 12 parts of glossy privet fruit, 6 to 12 parts of Cassia alata L, 1 to 5 parts of Viburnum foetidrm Wall, 3 to 9 parts of Amblystegium serpens, 15 to 25 parts of medicinal cyathula root, 6 to 12 parts of erycibe obtusifolia benth, 2 to 20 parts of securinega suffruticosa, 6 to 12 parts of bighead atractylodes rhizome, 2 to 10 parts of scandent schefflera stem and leaf, 6 to 12 parts of Acmella ciliate, 1 to 5 parts of glechoma longituba, 2 to 10 parts of fresh ginger, 1 to 5 parts of lobed kudzuvine root, 1 to 9 parts of mint, 5 to 15 parts of fructus forsythia, 3 to 9 parts of Poria cocos and 3 to 9 parts of Schisandra chinensis, mixing, adding water for decocting; removing filtrate after 30 minutes; adding water to dregs of decoction to go on decocting for 20 minutes, and then fetching filtrate, combining the filtrate of the two times, concentrating, drying and crushing, and then, mixing for applying. The external medicine disclosed by the invention has a unique stasis removal effect, is capable of promoting growth and development and axonal regeneration and the maintenance of the synaptic function of nerve fibers, is capable of deciding and inducing nervous processes to grow along a correct direction in redevelopment and regeneration of a nervous system, cannot cause normal axons to sprout, also has multiple effects of stopping pain, dissipating blood stasis and promoting blood circulation to remove meridian obstruction and is in favor of the treatment and recovery of the nerve post-injury.