The invention belongs to the field of molecular biological detection, and particularly belongs to the field of virus nucleic acid extraction. The invention discloses a composition for extracting 2019novel coronavirus nucleic acid. The composition is prepared from an extracting solution 1, an extracting solution 2 and an extracting solution 3, wherein the extracting solution 1 is prepared from guanidine hydrochloride, guanidine thiocyanate, urea, surfactin, potassium chloride, lithium chloride, triethanolamine lauryl sulfate, NP-40, triton X-100 and isopropanol; the extracting solution 2 comprises Tris-HCl, lithium chloride, sodium acetate, triethanolamine lauryl sulfate, NP-40, SDS and ethanol; and the extracting solution 3 comprises Tris-HCl, sodium chloride, and ethanol. By using the composition provided by the invention, the sensitivity of nucleic acid extraction and purification of 2019 novel coronavirus can be specifically improved, and the detection limit can reach 10 copies / mL.