NOVELTY - Optimization extraction of sea buckthorn leaf flavonoid involves taking sea buckthorn leaves, crushing, optimizing surfactant type by sucrose ester-assisted extracting in water bath at 60 degrees C and solid-liquid ratio of 1:50 for 60 minutes using 5% ethanol and sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, bis(2-ethylhexyl)sulfosuccinate and polyoxyethylene lauryl ether respectively as surfactant and optimizing ethanol concentration by sucrose ester-assisted extracting in water bath at 60 degrees C and solid-liquid ratio of 1:50 for 1 hour using 5%, 10%, 20%, 40% and 60% ethanol respectively.    USE - Method for optimizing extracting sea buckthorn leaf flavonoid (claimed).    ADVANTAGE - The method is environment-friendly, energy-saving, shortens extraction time and has higher extraction efficiency.    DETAILED DESCRIPTION - Optimization extraction of sea buckthorn leaf flavonoid comprises taking sea buckthorn leaves, crushing to 100-mesh, optimizing surfactant type by sucrose ester-assisted extracting in water bath at 60 degrees C and solid-liquid ratio of 1:50 for 60 minutes using 5% ethanol and sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, bis(2-ethylhexyl)sulfosuccinate, polyoxyethylene lauryl ether, cetyltrimethylammonium bromide, dodecyltrimethylammonium chloride and Tween 20 (RTM: polyoxyethylene (20) sorbitan monolaurate) respectively as surfactant, optimizing ethanol concentration by sucrose ester-assisted extracting in water bath at 60 degrees C and solid-liquid ratio of 1:50 for 1 hour using 5%, 10%, 20%, 40% and 60% ethanol respectively, optimizing extraction temperature by sucrose ester-assisted extracting in water bath at solid-liquid ratio of 1:50 and 40 degrees C, 50 degrees C, 60 degrees C, 70 degrees C and 80 degrees C respectively for 1 hour, optimizing extraction time by sucrose ester-assisted extracting in water bath at 60 degrees C and solid-liquid ratio of 1:50 for 30 minutes, 1 hour, 1.5 hours, 2 hours and 2.5 hours respectively and performing standard rutin detection method.