The invention provides a heat-resistant, antibacterial and sun-proof camellia flower nanometer microcapsule with long-term slow release effect and a preparation method thereof. An essence capsule is characterized in that camellia flower oil is used as a core material, titanium dioxide and silicon dioxide are used as wall materials, and a sol-gel-spraying reaction method is adopted to prepare the heat-resistant, antibacterial and sun-proof camellia flower nanometer microcapsule with long-term slow release effect by one step. The essence capsule has the characteristics that the heat-resistant property is good, the antibacterial, sun-proof and weather-resistant properties are realized, the poison is avoided, the agglomeration amount is small, the content of impurities is low, and the re-dispersing processing is easy; the medical effects of clearing heat and dehumidification, dispelling wind and relieving itching, killing insects and detoxifying, clearing stomach and moistening intestines,restringing and nourishing skin, eliminating swelling and relieving pain, promoting eyesight and brightening hairs, enhancing elasticity and toughness of blood vessels, delaying atherosclerosis, enhancing intestine and stomach absorption function, promoting hormone excretion of endocrine glands, preventing degrading of neural functions, enhancing immunity of a human body, preventing and treatinghypertension, preventing and treating cardiovascular diseases and the like are realized; the heat-resistant, antibacterial and sun-proof camellia flower nanometer microcapsule can be widely applied tothe industries of textiles, daily chemicals, foods, medicines, face beautifying, health care and the like.