NOVELTY - Preparation of a water retention polypeptide compound microorganism fertilizer, involves pretreating high water absorbent resin powder, organic fertilizer, agricultural microbial inoculum, and polypeptide (or amino acid) solution, preparing attapulgite clay composite adsorbent solution using attapulgite clay mineral, uniformly mixing attapulgite clay compound absorbent solution, polypeptide solution and high water absorption resin powder, then adding organic fertilizer and agricultural microbial agent, uniformly agitating to mix, pelletizing, and drying pellets.    USE - The method is useful for preparing water retention polypeptide compound microorganism fertilizer (claimed).    ADVANTAGE - The water retention polypeptide compound microorganism fertilizer has a stronger absorbing performance, thus the microbial fertilizer can be integrally combined with organic and inorganic composite colloids in soil, the colloids in the soil can be effectively prevented from losing, a water retention performance can be improved, a slow release performance of the fertilizer is improved, and the soil can be repaired, lose of water in the soil is prevented, hardening can be removed, and the problem due to the hardening of the soil can be gradually repaired.    DETAILED DESCRIPTION - Preparation of a water retention polypeptide compound microorganism fertilizer, involves (a) pretreating high water absorbent resin powder, organic fertilizer, agricultural microbial inoculum, and polypeptide (or amino acid) solution, where the content of gamma polyglutamic acid is 4-6 wt.% in the polypeptide solution, (b) preparing attapulgite clay composite adsorbent solution by selecting 40-50% attapulgite clay mineral, piling the clay mineral, homogenizing, adding water to the homogenized material, adjusting mass to volume ratio of attapulgite clay to water to be 2-3 g/ml to form a attapulgite clay sheet, cutting and extruding the attapulgite clay sheet, drying and smashing into 200 sieve powder, adding 20-30 kg attapulgite clay powder into 100 l water, stirring the mixture to obtain uniform slurry, adding 2 kg aluminum chloride, stirring and reacting for 2-3 hours to obtain the attapulgite clay composite adsorbent solution, and (c) obtaining 100-150 l attapulgite clay compound absorbent solution, 60-80 l polypeptide solution and 40-60 kg high water absorption resin powder, uniformly mixing, and then adding 700-900 kg organic fertilizer and 10-20 kg agricultural microbial agent, uniformly agitating and mixing, pelletizing, and drying to obtain particles with diameters of 2.0-4.0 mm.