The fiber Bragg grating (FBG) sensor technology is used to measure the concrete face strain during the experiment on the concrete inward detonation. The historical curves of the concrete face strain under the load function of the inward detonation are obtained and analyzed preliminarily. The results show that the proposed measurement method is feasible, the effects of gravity on the concrete surface strain distribution of blasting load is verified, and the collision response of the concrete specimen and the test pit was captured.