The invention discloses a preparation method of 
pericarpium citri reticulatae absolute oil. The 
pericarpium citri reticulatae absolute oil is obtained through the steps of 
pericarpium citri reticulatae crushing, pericarpium citri reticulatae fermenting, pericarpium citri reticulatae extracting, extracting and filtering, concentrating, 
alcohol precipitating and concentrating. According to the obtain pericarpium citri reticulatae absolute oil, the content of flavonoids such as 
hesperidin, 
nobiletin and 
tangeretin and the content of volatile oil such as 
limonene are high, therefore, the unique 
aroma of pericarpium citri reticulatae is effectively kept, and the natural 
flavor is clearer when the pericarpium citri reticulatae absolute oil is applied to the cigarettes; in addition, the application range of the absolute 
oil can be wider, the state and 
solubility problems of a pericarpium citri reticulatae extract are solved, and the absolute 
oil can be better applied to the cigarettes; the preparation process is simple, the 
operability is high, the whole production process is efficient, and the method is suitable for industrialized implementation; on the other hand, when the pericarpium citri reticulatae absolute oil prepared through the method is applied to the cigarettes, the 
mouthfeel and the 
aftertaste of 
cigarette smoking can be improved, the special natural 
flavor can be given to the cigarettes, and the 
smoke quality can be promoted.