The invention belongs to the technical field of microbial fertilizer adsorbents and relates to a microbial fertilizer adsorbent composition which comprises the following components in parts by weight: 10-35 parts of bagasse, 1-9 parts of peat and 18-32 parts of carbonized tobacco stem. Generally, the composition contains 34-45 percent by weight of bagasse, 41-62 percent by weight of peat and 3-12 percent by weight of carbonized tobacco stem. The pH of the microbial fertilizer adsorbent composition is 6.7-7.5. The microbial fertilizer adsorbent composition has better adsorption and preservation effects on microbial fertilizer strains and is remarkably better than peat in preservation effect.