Long-scale-distance vibrating wire strain gauge

The invention discloses a long-scale-distance vibrating wire strain gauge which comprises a strain gauge body, a front extension structure and a rear extension structure. The front extension structure comprises a first extension rod and a first connecting unit connected with the bridge, one end of the first extension rod is fixed at the front end of the strain gauge body, and the first connecting unit is fixed at the other end of the first extension rod; the rear extension structure comprises a second extension rod and a second connecting unit connected with the bridge, one end of the second extension rod is fixed at the rear end of the strain gauge body, and the second connecting unit is arranged at the other end of the second extension rod. According to the invention, the two sides of the strain gauge body are respectively provided with a lengthening rod with the length in a range of 1.5-3.0 m, on one hand, the strain monitoring length is increased, the strain monitoring length is 3.0-6.0 m, long gauge leng