The invention discloses essence capable of tightening the skin and resisting senilism and a preparation method of the essence. The essence comprises trehalose, nicotinamide, an emulsifier, a preservative, panthenol, dipropylene glycol, a glyceryl acrylate / acrylic acid copolymer, glyceryl polyether-26, a pH regulator, a thickener, essence, sea fennel extract, sodium hyaluronate, butanediol, olive fruit extract, palmitoyl hexapeptide-12, hydrolyzed yeast extract, polyquaternium-51, sodium pyrrolidonecarboxylate / betaine / sorbitol / glycine / alanine / proline / serine / threonine / arginine and water. The preparation method is simple, and the components are uniformly mixed in batches. Active ingredients such as the sea fennel extract, the olive fruit extract, the hydrolyzed yeast extract, the sodium hyaluronate, the nicotinamide and the trehalose are added into the essence, so that the essence has excellent effects of resisting oxidation, whitening the skin, locking the water for preserving moisture and tightening the skin, namely, has a good repairing effect on the aged and damaged skin.