The invention provides an essence with a tree moss extract function and a preparation technology thereof .The essence is prepared from, by mass, 10-30% of molecular distillation first-stage fraction of tree moss extract, 15-50% of molecular distillation second-stage fraction of tree moss extract, 10-40% of molecular distillation third-stage fraction of tree moss extract, 0.2-2% of geranyl acetate, 0.5-2.5% of cis-3-hexenyl acetate, 0.4-2% of menthyl acetate, 0.6-2.2% of cinnamyl acetate, 0.1-1.5% of 1% bread ketone, 0.8-5% of 1% damascenone, 0.2-1.5% of 1% 2,3,5-trimethyl pyrazine, 0.9-3% of 1% geranium oil, 15-40% of propylene glycol and 10-40% of edible alcohol .The fractions for essence compounding are derived from the tree moss extract and obtained through a molecular distillation technology, no waste liquid or waste gas is produced in the whole process, preparation is safe and environmentally friendly, and industrial batch production is easy to achieved; the natural property of the essence is ensured to the greatest possible, and the natural fragrance feature is provided for the product .