A puncture needle comprising a damage-free protection device. The puncture needle comprises a handle part (202), a distal part (206), and a rod part (204) therebetween. The distal part (206) comprises a fixed part (210) and a movable part (260). The fixed part (210) comprises working edge (220). The fixed part (210) extends from a distal end to a proximal end and is fixed together with the rod part (204) or the handle part (202), while the movable part (210) is movable with respect to the fixed part (260) along the axial direction of the rod part (204). The movable part (206) comprises a protective sheath (280); the protective sheath (280) comprises an inclined distal end (286) and a blade groove (287); the inclined distal end (286) comprises a rigid part (291) and a flexible part (296). The flexible part (296) is attached to the surface of the rigid part (291) to constitute a sharp structure. The protective sheath is made of at least two materials, i.e., the protective sheath comprises the rigid part and the flexible part. The lower the hardness of the flexible part, the smaller the damage capability thereof to the muscle of a patient, and the better the effect of impact force absorption.