PURPOSE: A coating liquid containing a natural antibacterial agent and a photocatalytic material is provided to maximize antibacterial activity and to maintain freshness of fruits. CONSTITUTION: A coating liquid contains: a natural antibacterial agent including one or more among a mixture of phytoncide and thymol, a mixture of phytoncide and spearmint, and phytoncide； and a photocatalytic material. The photocatalytic material is titanium dioxide. The coating liquid further contains activated charcoal and a binder. The binder includes poly urethane, PVB cellulose, or organic silane. A plastic bag for fruits contains the coating liquid. A method for manufacturing the coating liquid comprises: a step of preparing nanocolloidal titanium dioxide； a step of mixing the nanocolloidal titanium dioxide with the mixture of phytoncide and thymol, the mixture of phytoncide and spearmint, or a phytoncide solution and preparing a photocatalystic solution； and a step of mixing with the binder. Phytoncide essential oil is prepared through an extractor comprising a distilling tank(1), a cooling device(2), an oil and water separator(3), and a steam generator(4). [Reference numerals] (4) Boiler피톤치드와 티몰의 혼합물, 피톤치드와 스피아민트의 혼합물 및 피톤치드 중의 적어도 하나를 포함하는 천연 항균제, 그리고 광촉매 물질을 포함하는 코팅액.
