The invention discloses an antiseptic which is composed of perilla leaf essential oil, cinnamon essential oil and Chinese ilex essential oil and also discloses an egg film fresh-keeping agent especially a naturally-emulsified egg film fresh-keeping agent, and its preparation method, wherein the egg film fresh-keeping agent is composed of plant oil, a film forming agent, an emulsifier, a preservative and water. The antiseptic of the invention treats the plant essential oils as raw materials and has a good inhibition effect on Escherichia coli, salmonellas and the like. The egg film fresh-keeping agent of the invention, which adopts natural raw materials and has the advantages of good fresh keeping effect and high safety when it is applied to egg films, can effectively prevent the loss of water in eggs, and yolk dispersion, inhibit microbial invasion, prevent the rancidness of eggs, and effectively prolong shelf lives of the eggs.