The utility model discloses a sliding puncture needle protecting jacket. A linear sliding chute is longitudinally formed in the pipe wall of the protecting jacket; a V-shaped opening is formed in the front end of the sliding chute; an inverted L-shaped groove is formed in one side of the rear end of the sliding chute; a needle handle can slide in the protecting jacket along the sliding chute and is fixed in the groove through the groove, so that a needle head is positioned in the protecting jacket. The sliding puncture needle protecting jacket is simple in structure, convenient to operate, economic and practical, the cost is reduced, the danger that medical staff are infected with disease caused by the fact that the needle head is exposed to stab the medical staff after being used is avoided, and the personal safety of the medical staff during working is ensured.