The invention discloses a fiber bragg grating strain measurement model used for a rock-soil expansion anchor rod. The fiber bragg grating strain measurement model used for the rock-soil expansion anchor rod comprises a metal rod, a pressure tip, a sleeve, a hollow rod and a plurality of fiber bragg gratings. The upper end of the sleeve is open, and the lower end of the sleeve is closed. A disc isarranged at the bottom of the pressure tip, at least three circular rings are arranged at the top of the pressure tip, and each circular ring is connected with the bottom disc through four pressure columns which are arranged at equal intervals. The pressure columns and the bottom disc of the pressure tip are inserted into the sleeve through an opening in the upper end, and the bottom disc and a sleeve base plate are fixedly connected through the hollow rod. The metal rod penetrates through the innermost circular ring at the top of the pressure tip to be fixedly connected to the top surface ofthe bottom disc of the pressure tip. The fiber bragg gratings are pasted on the metal rod, the pressure columns of the pressure tip and the hollow rod separately. When the whole model is buried in a rock-soil body, drawing force is directly applied to the top end of the metal rod, then the strain of all portions of the model can be obtained through the fiber bragg gratings, and then the internal force of the model for the expansion anchor rod is obtained by calculation.