The invention discloses an herbal extract of treating lung tumor. The herbal extract comprises Antrodia cinnamomea and Cordyceps militaris, and the herbal extract is manufactured as following: mingling Antrodia cinnamomea and Cordyceps militaris with a weight ratio being between 1:5 and 5:1 to obtain a mixture; blending the mixture with a solvent with a weight-volume percentage being 50%, followed by extracting at 40-90° C. to obtain a herbal solution; and concentrating the herbal solution to obtain the herbal extract.