Lens transmission mechanism

The invention discloses a lens transmission mechanism which comprises a base. The base is provided with a lens zooming group capable of sliding on the base. The base is provided with a driving device; the base is provided with a gear connected with the output end of the driving device; the base is provided with a guide cylinder; the guide cylinder is provided with a straight-line guide groove; the guide cylinder is sleeved by a rotating cylinder; the outer wall of the rotating cylinder is provided with a gear disc engaged with the gear; the inner wall of the rotating cylinder is provided with an inner thread; a gear ring engaged with the inner thread of the rotating cylinder is arrange between the rotating cylinder and the guide cylinder; and the gear ring is connected with the lens zooming group by enabling a plurality of circular rings to pass through the straight-line guide groove in the guide cylinder. The precision of the transmission mechanism can reach 0.015 mm/3.6 DEG; and the transmission mechanism is simple in structure, compact in structure and high in zoom ratio.