The invention relates to an enrichment method of a peppery component suitable for preparing an electronic cigarette liquid. The enrichment method is characterized by comprising the following steps: (1) extracting a tobacco leaf extract from tobacco leaves by virtue of a solvent; (2) weighing the tobacco leaf extract, carrying out centrifugal filtration and column chromatography separation, collecting each fraction according to the volume of eluent, and respectively marking the fractions as N1, N2,......, etc.; (3) after the fractions are tasted by at least three professional evaluation persons and the peppery fraction is determined, freeze-drying the peppery fraction by virtue of a freeze-drying machine, and enriching the peppery fraction; and (4) adding the enriched peppery fraction into propylene glycol or glycerinum, so as to prepare the electronic cigarette liquid. The enrichment method is guided through sensory evaluation, the tobacco leaf extract is separated by virtue of column chromatography, different numbers of the fractions are collected and are tasted, and the peppery fraction is freeze-dried by virtue of the freeze-drying machine and is enriched. The enrichment method has the advantages that the flow is simple, the operation is convenient, and the application range is wide; and furthermore, the obtained peppery component is derived from the tobacco leaves, so that the prepared electronic cigarette liquid has strong tobacco fragrance and can meet sensory requirements of smokers.