The invention discloses a method for extracting flavones from waste slags of citrus bergamot drink, sequentially comprising the following steps of: 1) alkali extraction: adding water to the waste slags of the citrus bergamot drink and adjusting a pH value to be 9.0-9.8 by using lime milk, and digesting at 38-42 DEG C; 2) acid precipitation: first, adding an acid to a filter liquor to adjust the pH value to be 4.0-5.0, and then adding hydrophobic modified polyoxyethylene, and splitting phases after standing at the room temperature; and 3) alkali dissolution and acid precipitation: first, adding an alkali to an obtained polymer phase to adjust the pH value to be 9.0-10.0 and then centrifuging; adding an acid to an obtained water phase to adjust the pH value to be 4.0-5.0 and then standing at the room temperature to separate out rough flavones; and washing and recrystallizing the rough flavones to obtain the flavones. By using the method disclosed by the invention, the flavones can be extracted from the waste slags of the citrus bergamot drink; and the method has the characteristics of short process period and high extraction rate.