The invention belongs to the technical field of adsorbent for a microbial fertilizer, and relates to a water hyacinth containing adsorbent composition for the microbial fertilizer. The adsorbent composition is prepared from the following constituents in parts by weight: 0.5-5 parts of water hyacinth, 1-10 parts of bagasse, 0.2-3 parts of brown coal, and 0.2-3 parts of biogas residue, wherein generally the percentage content of the water hyacinth in the composition is 20-30%, the percentage content of the bagasse is 45-54%, the percentage content of the brown coal is 7.5-17.5%, and the percentage content of the biogas residue is 7.5-17.5%. The adsorbent can adsorb and preserve bacteria of the microbial fertilizer well and is better than turf in effects.