The invention provides prepared 
cibotium barometz tuber effective parts and a preparation method thereof. The preparation method comprises the following steps of taking 40g of prepared 
cibotium barometz tuber medicinal material 
fine powder, adding 800mL of 
methanol-water in the volume ratio being 70 to 30, performing 
reflux extraction twice, wherein the 
reflux extraction time each time is 2h, performing 
filtration, and taking filtrate for standby application; additionally taking 3g of activated DM2 type resins, and performing loading into a column; taking 15mL of a 
cibotium barometz tuber extracting solution, conveying samples to a detection instrument, performing adsorption for 4h, performing eluting with 45mL of 
methanol-water in the volume ratio being 20 to 80, collecting an eluent, andperforming 
evaporation to 
dryness so as to obtain the prepared 
cibotium barometz tuber effective parts. According to the 
cibotium barometz tuber effective parts prepared by the method, the kojic acidcontent in percentage by 
mass is more than 0.4%, the 5-HMF content in percentage by 
mass is more than 13.5%, the 
protocatechuic acid content in percentage by 
mass is more than 0.6%, and the 
protocatechuic aldehyde content in percentage by mass is more than 0.5%. The preparation method is simple and environmental-friendly and is suitable for large-scale industrial production.