Abstract: A quick insertion-and-removal device comprises: a base connected to a surgical instrument; an outer sheath limiting assembly comprising a limiting element capable of moving relative to the base, wherein the limiting element is configured to lock or unlock an outer sheath; a push-rod limiting assembly comprising a sliding sleeve capable of moving relative to the base to lock or unlock a push rod; and a mounting-dismounting control assembly comprising a joint unlocking member, wherein the joint unlocking member is connected to the sliding sleeve and can drive the sliding sleeve to move, relative to the base, to a position where the push rod is unlocked, and in this position, the joint unlocking member is engaged with the limiting element and can unlock the outer sheath.