The invention relates to a kind of natural medicine of broad spectrum antibiotic. At present, the broad spectrum antibiotic medicine with high effect and safety is at shortage all round the world. The invention is intended to extract laminarinsulphate or sulphonic acid sugar ester or sulphosalts from plant chickweed or other chickweed plant with two resin adsorption methods or a water extraction and alcohol precipition method. The spectrum antibiotic in the invention is distributed under 50,000 in the formula weight formed by carbon glycosidic bond and/or oxide glycosidic bond with phenol, especially the total flavones comprising apigenin. However, the invention mainly acts as total phenolic glycoside with the formula weight under 4,000. Besides, the invention can form brownish compound with the total flavones comprising apigenin and the glycosidic ingredients without sulfur element, so as to be applied as broad spectrum antibiotic drug. Therefore, the compound in the invention can be applied to cure ADIS virus, hepatitis virus, influenza virus and parainfluenza virus comprising SARS, adenovirus, verruca acuminate virus, enterovirus, mumps virus, herpes simplex virus, herpes zoster virus and varicella. No toxic effect has been found in the application. What is more, the invention can be made into 10 sorts of formulation, disinfector and health-improving products.