An extravascular protective stent includes a booster, a hollow protective tube and a hollow separator all sequentially arranged, wherein the side wall of the protective tube is provided with a protective notch parallel to the central axis of the protective tube and extending through two ends of the protective tube. During use of the separator and the protective tube when an internal carotid artery is exposed after a common carotid artery bifurcation is separated via a submandibular incision, the separator and the protective tube wrap the internal carotid artery in sequence, allowing the separating notch and the protective notch to face outward, and the closed wall thereof to face inward and directly face the surgery direction, such that a surgeon can thoroughly excise diseased tissue in surgery and avoid hemorrhage caused by accidentally injuring the internal carotid artery during the surgery, and improve the surgical efficacy.
