Microbial induced calcium carbonate precipitation (MICP) cemented remolded mudstone samples prepared by different concentrations (0.3, 0.5, 0.7mol/L) of nutrient salt were prepared by one-time soaking solution. The cemented samples were tested based on direct shearing, consolidation, calcium carbonate pickling and scanning electron microscopy (SEM). The effects of nutrient concentration on the mechanical properties, calcium carbonate content and microstructure of the cemented samples were analyzed. The results show that under the same reaction conditions (same time, volume), the shear strength and pore ratio increase first and then decrease with the increase of nutrient concentration. When the nutrient salt concentration reached 0.5mol/L, the shear strength and void ratio were the largest. At this time, the cohesive force and internal friction angle of the sample were 15.5kPa and 18.83 °, respectively. The content of calcium carbonate increased with the increase of nutrient concentration. When the concentration of nutrient salt reached 0.7mol/L, the average calcium carbonate content of the sample increased less. The uniformity of calcium carbonate crystal distribution changes in a convex shape with the change of nutrient salt concentration from low to high. The strength of the cemented sample depends on the amount of CaCO3 crystals formed and their distribution. The resulting calcite-type calcium carbonate crystals are mainly deposited at the contact of the particles to form accumulated crystals or filled in the pores to form a "bonding bridge", which produces a cementation effect and enhances the mechanical properties of the sample.