Measuring tape with damping structure

The invention relates to a measuring tape with a damping structure. The measuring tape comprises a tape shell composed of a half shell A and a half shell B; a clockwork spring, a rotating wheel and atape belt are arranged in the tape shell; a mandrel is arranged in the middle of the half shell B and sleeved with a rotating wheel; the clockwork spring is arranged on the inner side of the rotatingwheel; the tape belt is wound on the outer side of the rotating wheel; a circular damping groove with the circle center located in the rotating center of the rotating wheel is formed in the rotating wheel; the damping structure is arranged in the circular damping groove; the damping structure comprises a long-strip-shaped connecting piece which is connected with the rotating wheel and can be driven by the rotating wheel to rotate and a pair of speed reducing pieces hinged to the two ends of the long-strip-shaped connecting piece respectively; the speed reducing pieces are located on the side,opposite to the rotating di