A novel technique for measuring Young′s modulus of metal beams based on fiber Bragg gratings (FGBs) and three-point bend test is proposed. The FBG is sticked on the target metal beam and the three-point bend test method is used to load the force on the sheet. A universal formula for measuring Young′s modulus of various sheetshaped solid materials is derived, which is used for the experimental measurement of the Young′s modulus of iron and copper sheets. Experimental results show that the measurement errors of the two metal beams are 0.5% and 0.6% comparing to the nominal Young′s modulus, and the relationship between the reflected central wavelength and the loaded force is a good linearity. Moreover, the stick location of FBG has a negligible impact on the measurement precision. The proposed method has a potential application prospect in the field of Young′s modulus measurement of solid materials.