The invention relates to arachis hypogaea L. nerve-soothing oral liquid and a preparing method and application thereof. The preparing method of the arachis hypogaea L. nerve-soothing oral liquid comprises the following steps of taking ramulus et folium arachis hypogaea L., adding 10-fold water to conduct soaking for 2-4 h, conducting decocting twice, and adding 10-fold water for the second time, wherein decocting is conducted for 1 h every time; filtering decoction liquid, merging filtrates to be concentrated to the relative density of 1.15-1.20, chilling, adding ethyl alcohol to make the alcohol content reach 60%, uniformly stirring the mixture, standing for 24 h, filtering to obtain liquid supernatant, recycling ethyl alcohol in the filtrate till the filtrate has no smell of alcohol, adding water and uniformly stirring the filtrate, standing for 24 h, taking the liquid supernatant to be filtered, adding distillate, saccharose and sodium benzoate to be dissolved, adjusting the relative density to 1.07-1.10, conducting cold storage and standing for 48 h, filtering, adding water to the filtrate, boiling under the sealed condition, and filling and sterilizing to obtain the arachis hypogaea L. nerve-soothing oral liquid. By means of the arachis hypogaea L. nerve-soothing oral liquid and the preparing method and application thereof, active components of ramulus et folium arachis hypogaea L.for treating anhypnia are sifted and serve as indexes, and the optimum preparing technology of the arachis hypogaea L. nerve-soothing oral liquid preparation is sifted out.