Stone relics suffering from diseases such as cracks due to deterioration, need proper restoration methods. In our work, in order to simulate the restoration of cracks in stone relics, the technology of microbially-induced carbonate precipitation was applied to the restoration of broken marble beams. The research objects were some white marble beam models (40 mm × 40 mm × 160 mm) with V-shaped cracks, some of which penetrated the beam completely and some that did not. The restoration method was grouting and free infiltration. The effect of restoration was evaluated by comparing the change of load capacity and flexural strength before and after the restoration and by visualizing the restoration process of through cracks using computed tomography (CT) scanning. The results show that after restoration, 1) the surfaces of the cracks are dense and smooth, the color is similar to that of the base material and that the overall appearance is nice; 2) the load capacities of beams with non-through cracks were all increased, and the flexural strengths of the beams with through cracks reached a mean value of 3.684 MPa (recovering up to 35.12% of the original strength) and the maximum value of 5.234 MPa. The qualitative and quantitative results of CT scanning also indicate that the density of bio-cementation increases as the restoration goes on, and that the restoration quality of contact surfaces is weaker than that of other locations.