Puncture needle for automatically controlling puncture depth

The utility model discloses a puncture needle for automatically controlling puncture depth, and belongs to the technical field of medical instruments. The puncture needle comprises a needle handle (1), a needle core (2) and a needle body (3). The puncture needle is characterized in that scale marks are arranged on the outer wall of the needle body (3) in which the needle core (2) is sleeved, a support arm (5) of which the other end is provided with a sleeve (4) is vertically fixed on the side wall of the needle handle (1), a supporting rod (6) parallel to the needle body (3) is fixed in the sleeve (4) through a fastening bolt, and a circular limiting plate (7) is arranged at the lower end of the supporting rod (6). The puncture needle is simple in structure, is easy and convenient to operate, time-saving and labor-saving during puncture of a patient, and can control the puncture depth and lighten the working difficulty of medical personnel.