Washing essence comprising 2-pentylcyclopentanone is disclosed. The washing essence comprises following components by mass: 0.1% of ethyl 2-methylbutyrate, 0.1% of ethyl 2-methylvalerate, 0.2% of octyl aldehyde, 0.6% of D-limonene, 0.7% of p-methyl anisole, 1% of dihydromyrcenol, 0.4% of allyl hexanoate, 2% of triplal, 2% of linalool, 0.6% of methyl benzoate, 0.1% of rose oxide, 4% of phenethyl alcohol, 0.2% of camphor, 4% of benzyl acetate, 1.5% of styralyl acetate, 0.4% of terpilenol, 0.7% of decanal, 2% of citronellol, 0.2% of allyl amyl glycolate, 0.1% of citral, 0.5% of geraniol, 0.1% of linalyl acetate, 0.8% of anisic aldehyde, 3% of the 2-pentylcyclopentanone, 1.2% of dipropylene glycol, and the like. Using of the 2-pentylcyclopentanone allows the whole fragrance of the essence to be finer and fuller, and aroma reserving effects to be more durable.