The invention discloses a safe needle with a buckling groove structure, and belongs to the technical field of medical materials. The safe needle comprises a cover, a needle head part, a needle base, a second sleeve and / or a first sleeve. The cover is in sliding fit with the second sleeve, the needle head is fixedly installed in the needle base, the first sleeve is in sliding fit with the needle base, and the second sleeve is in sliding fit with the first sleeve. Buckling grooves are formed in the surfaces of the needle base and the first sleeve, the first sleeve is provided with first elastic sheets, and first hooks are arranged on the lower surfaces of the first elastic sheets; the second sleeve is provided with second elastic sheets, and second hooks are arranged on the lower surfaces of the second elastic sheets. The inclination angle of the buckling grooves is matched with the inclination angle of the hooks, so that when the safe needle is started, the first sleeve and the second sleeve outwards slide and are pulled to be locked, and the safe needle is wrapped with the sleeves. The safe needle is simple in structure, easy to operate and low in manufacturing cost, potential safe hazards are avoided, and the good popularization performance is achieved.