The invention provides a method for extracting flavonoid glycoside substance, comprising the following steps of: taking orange pericarp removed with impurities and dry powder of persimmon leaf as rawmaterials, and extracting with 20-80% alcohol; setting aside, precipitating, taking supernatant, adding diatomite that is 1-5% of supernatant in terms of mass, fully stirring, pressing and filtering by a plate filter, membrane-filtering the filtrate B with PES membrane material, and taking the micro-molecular solution passing through the membrane; putting the obtained micro-molecular solution intoa film evaporator to remove impurities by molecular distillation, collecting the required distillate, performing spray drying, and making into powder to obtain the flavonoid glycoside substance. Themethod for extracting flavonoid glycoside substance has quite simple and convenient operation and low cost, and can save a large amount of solvent, reduce the requirements on the device, also reduce pollution on the environment and well guarantee the natural quality of the flavonoid glycoside substance; the content of flavonoid glycoside component in the produced flavonoid extract is high with a total content of more than 70%, and the transfer rate of general flavone can reach more than 95% with less residual pigment.