NOVELTY - Preparing kukoline hydrochloride capsule involves: preparing kukoline hydrochloride crude extract which involves to thick powder of Caulis sinomenii adding hydrochloric acid, wetting, percolating to obtain decoction liquid; extracting which involves adjusting pH, extracting with chloroform, washing by water, decompressing; crystallizing which involves adding to obtained molten or mixed medicine solution hydrochloric acid to adjust pH, stirring, refrigerating, filtering, drying filter cake to obtain yellow acid product; acid refining product; and preparing into capsule.    USE - For preparing kukoline hydrochloride capsule (claimed), useful for producing analgesic and anti-inflammatory effects such as in treating pain, rheumatoid arthritis, ankylosing spondylitis, and arrhythmia.    ADVANTAGE - The method for preparing kukoline hydrochloride capsule adopts percolation method, has simple operation and extraction and simple mother liquor treatment, does not need heating, product has high stability and is obtained in high yield, process has high reliability, causes low pollution, and provides environmental protection.    DETAILED DESCRIPTION - Method for preparing kukoline hydrochloride capsule involves: preparing kukoline hydrochloride crude extract which involves to thick powder of Caulis sinomenii (100-1000 parts) adding 0.1-1 mol/L HCl (60-1000 parts by volume), wetting for 5-8 hours, adding to percolation cylinder, then adding 0.1-1 mol/L HCl to make liquid level covering to 2-6 cm, impregnating for 6-48 hours, starting percolating at speed of 2-6 ml/minute for 6-24 hours, and stopping percolating to obtain decoction liquid for further use; extracting which involves adding to liquid obtained lime milk to adjust pH to 10.5-12, filtering, adding hydrochloric acid to adjust pH to 7-9.5, using chloroform to extract for 2-5 times, combining chloroform layers, washing by neutral water, adding anhydrous Na2SO4 (3-6%), decompressing, concentrating and recycling chloroform; crystallizing which involves adding to molten or mixed medicine solution obtained 6 mol/L HCl to adjust pH to 2-4, stirring to disperse floating solid, refrigerating, filtering, removing filtrate, drying filter cake at 60-70 degrees C to obtain yellow acid product; acid refining that involves taking acid crude product (5-10 parts by weight (pts. wt.)), adding 10-95% ethanol or purified water (30-120 parts by volume) until it is completely dissolved, heating and refluxing, adding active carbon (4%), preserving temperature and refluxing for 10-30 minutes, filtering when it is hot, concentrating filtrate, cooling, crystallizing, filtering, using 95% alcohol to wash filter cake until filtrate is colorless to obtain kukoline hydrochloride; and preparing capsule that involves to obtained kukoline hydrochloride, adding sucrose (5-45 pts. wt.), starch (25-65 pts. wt.), microcrystalline cellulose (25-45 pts. wt.), magnesium stearate (15-45 pts. wt.), 5% povidone water solution (0.5-1.5 pts. wt.), and purified water (30-50 parts by volume), making into granule with 5% water solution, drying, and packing in capsule to obtain finished product.