The invention discloses a eucommia ulmoides key fruit hull treating method beneficial to extraction of gutta-percha. The eucommia ulmoides key fruit hull treating method comprises the steps: (1), preparing an irpex lacteus seed solution; (2), inoculating and culturing a eucommia ulmoides key fruit hull; and (3), treating after fermenting. The dry weight of the treated eucommia ulmoides key fruit hull is reduced by 35-42 percent due to effective degradation of the irpex lacteus, the gutta-percha in the fruit hull can reach 50-60 percent, the efficiency and rate of extracting the gutta-percha by using organic solvents such as petroleum ether are greatly increased, and the glue quality is remarkably improved. The treatment effect of the eucommia ulmoides key fruit hull treating method is superior to an existing enzymic method and a distiller's yeast and yeast fermentation method; the eucommia ulmoides key fruit hull treating method has no damage to environment; the environment benefit of the eucommia ulmoides key fruit hull treating method is superior to that of an alkali treatment method; the eucommia ulmoides key fruit hull treating method is stronger in actual application value.