The invention discloses a method for extracting flavone from leaves of guava. The method comprises steps as follows: (1) the leaves of guava and adsorbent particles are added to a slightly alkaline water solution leaching agent, and stirring and leaching are performed; (2) after stirring and leaching, flotation is performed, and floated residues are separated; (3) a leaching solution left after the floated residues are separated in the step (2) and the adsorbent particles are subjected to solid-liquid separation, an adsorbing tail solution and the adsorbent particles supporting flavone are obtained, the adsorbent particles supporting flavone are desorbed, and regenerated adsorbent particles and a flavone solution are obtained. The invention also provides flavone extracting equipment for the method for extracting flavone from leaves of guava. Floatation classification is adopted when flavone is extracted from leaves of guava, the floated residues can be repeatedly circulated and leachedwithout repeated solid-liquid separation, cooling and heating operation in a general process, the leaching rate is high and energy consumption is lower.