The present invention relates to a method for extracting buckwheat leaves to increase the content of phenylpropanoid compounds, and through analysis of the content of phenylpropanoid compounds in hot water extract of buckwheat leaves according to temperature, benzoic acid , The yield of rutin and quercetin is when the extraction temperature is 60°C, the yield of catechin is when the extraction temperature is 70°C, and the yield of epicatechin is when the extraction temperature is 80°C. , The yield of chlorogenic acid is when the extraction temperature is 90°C, and the yield of gallic acid, 4-hydroxybenzoic acid and caffeic acid is 100°C. When it was confirmed that there was a remarkable effect, an extraction method for obtaining each phenylpropanoid-based compound in the highest yield was established.
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