The invention relates to a method for preparing 
naringin or 
hesperidin, which comprises the following operating steps of: 1) 
drying and crushing fruits, fruit peels and fruit residues containing the 
naringin or the 
hesperidin, and respectively filling the crushed materials into an extraction kettle of a pressure 
solvent extraction device; 2) selecting an extraction 
solvent, setting an extraction pressure, an extraction temperature, an extraction static time and an extraction frequency, extracting with the pressure 
solvent extraction device, and collecting the extract liquor; and 3) concentrating the extract liquor in vacuum, centrifugating the extract liquor or filtering the extract liquor to remove insoluble substances, adjusting pH of the 
clear liquid, cooling the 
clear liquid to crystallize or precipitate, recrystallizing the coarse crystals, 
drying the coarse crystals, or re-dissolving the precipitate for re-
precipitation, and obtaining a pure product of the 
naringin or the 
hesperidin. Compared with the conventional 
solvent extraction method, ultrasonic-assisted extraction method and 
microwave-assisted extraction method, the preparation method has the advantages of high speed, capability of repeatedly extracting, safety, high efficiency, and simple 
post treatment such as concentration and purification.