Based on the principle of fiber Bragg grating(FBG) sensing technology,an innovative FBG dynamometer for anchor was developed,and loading and unloading experiments were carried out on the FBG dynamometer in laboratory.The results of experiments and theoretical analysis showed that the developed dynamometer was simple in structure,convenient to install,could be reused,easy to be protected and maintained,moreover,it had high accuracy,excellent stability and long distance of signal transmission,so it provided an impactful means for the long-term online monitoring of anchor support quality,and it had wide application prospect.